Abstract
The shrinkage characteristic of porous materials is an important consideration in the drying process, as it can significantly impact the texture of the dried product and energy utilization. This phenomenon is influenced by numerous factors, including the structure of the cells, drying conditions, and the glass transition temperature. To gain a deeper understanding of the drying process, it is necessary to develop theoretical models that account for the simultaneous heat and mass transfer processes at the cellular level, as well as simulation tools to analyze the associated changes in drying morphology. In this paper, we highlight several key factors affecting shrinkage during the drying of porous materials, and also outline drying modeling, morphological simulation, and drying technology design considerations to provide guidance for improving the drying quality of porous materials as well as energy conversion efficiency.
1 Introduction
Drying is one of the oldest unit operations, which is performed by applying heat to the material, resulting in diffusion of moisture inside the material to its surface and then the diffusion of moisture from the surface to the air, both of which occur simultaneously (; ). The process of drying is widely used to preserve materials by minimizing physical and chemical changes, reducing their water activity and extending their shelf life during storage. Also, the lower weight and volume of the dried product reduces transportation and storage costs (; ).
Porous materials usually have a high initial moisture content and porosity. The evaporation of water during the drying process is often accompanied by significant volume changes and tissue shrinkage (; ). The deformation in the material drying process directly affects the heat and mass transfer pattern of the material, which in turn affects the drying efficiency, the selection and design of the drying machine, the energy consumption of the drying process and the final product quality (; ). Porous materials undergo many physical and chemical changes during the drying process, and moisture migration and temperature distribution have a great impact on the drying shrinkage characteristics. Such as, Joardder et al. () showed that the migration of bound water within the tissue during drying has a significant effect on the shrinkage of the material. showed that the percentage shrinkage of the material increased with the increase in drying temperature. Therefore, the study of the factors affecting the shrinkage characteristics in the drying process is crucial for gaining a better understanding of this process and designing more effective drying technologies.
Drying models are essential tools for understanding the behavior of drying processes, designing and constructing effective drying systems, and reducing the associated experimental costs and time investment (; ). Currently available drying models can be categorized as macro-scale models, micro-scale models, and multi-scale models. The macro-scale model represents the overall drying characteristics (), while the micro-scale model considers tissue deformation and local distribution of water at the cellular level (). The multi-scale model couples the macroscopic model and the microscopic model (; Welsh et al., 2022). Drying performance is affected by various factors including drying parameters, dryer type, and properties of the drying material. Therefore, drying models are crucial for predicting ideal drying conditions and optimizing the drying process to enhance product quality.
Morphological modeling of porous materials has proven to be a useful tool for predicting composite indicators of plants under different drying conditions. For example, it can quantify the degree of drying curl (), estimate the photosynthetic production potential (; ), and determine the leaf area index (Wang et al., 2013). Such computational analysis tools provide valuable insights for evaluating the drying process, selecting suitable plant varieties, designing effective drying technologies, and reducing shrinkage in dried products. By leveraging these tools, researchers can optimize the drying process and produce high-quality dried products that meet the needs of various industries.
Traditional drying techniques for porous materials include atmospheric pressure hot air drying (), freeze drying (; ; ), supercritical drying (), solar drying () and microwave drying (). Each of these techniques has its own characteristics, such as atmospheric pressure hot air drying is easy to operate and low cost, vacuum drying is suitable for heat-sensitive materials, freeze drying can maintain the microstructure of porous materials, supercritical drying is suitable for highly fragile materials, and microwave drying can significantly reduce the drying time. However, a single drying technology has limitations such as long drying time and excessive energy consumption, which leads to poor quality of dried products. In order to improve the drying efficiency and quality of porous materials, hybrid drying technology has been widely used in the drying of porous materials (; ). Hybrid drying techniques for porous materials include hot air-vacuum drying (Zhao et al., 2014), freezing-microwave drying (), supercritical-hot air drying (), vacuum-microwave drying () and freezing-supercritical drying (Wang et al., 2019). By combining different drying methods, these techniques aim to achieve a more efficient and gentle drying process. Porous materials have attracted much attention due to their high specific surface area, diverse pore structures and tunable chemical and physical properties. Hybrid drying techniques combine the advantages of each while maintaining the unique properties of porous materials, enabling porous materials to exhibit superior performance in areas such as catalysis, separation, adsorption, sensors, and energy storage. Therefore, the selection of appropriate drying techniques is essential to maintain these advantages of porous materials.
This paper focuses on analyzing the primary factors that influence the shrinkage properties of porous materials, including cell structure, drying conditions, and glass transition temperature. The study will review the available drying models and morphological simulations for porous materials, as well as the various drying techniques currently in use. Figure 1 represents a summary diagram of the review of this paper. By understanding these key factors, we can inform the development of more effective methods for drying porous materials to minimize shrinkage and optimize the quality of the final product.
FIGURE 1
2 Shrinkage properties of porous materials
The shrinkage property of porous materials is worth considering in the drying property. The transport of water from the cellular location to the surrounding environment during the drying of porous materials leads to irregular volume changes, and this volume reduction is usually defined as shrinkage of the material (). Material shrinkage is a common physical phenomenon that affects energy consumption, process selection and design, drying efficiency, and the quality of the final product. (). Therefore, it is of theoretical and practical value to study the shrinkage characteristics of porous materials during drying. The shrinkage of porous materials during drying depends on many factors, including the type of material, cellular structure, drying conditions, and mechanical properties of the material.
2.1 The effect of different types of materials on shrinkage properties
Different types of porous materials have different shrinkage characteristics in the drying process. Porous materials are mainly divided into microporous (pores <2 nm), mesoporous (2–50 nm), and macroporous (>50 nm) types according to pore size (; Zdravkov et al., 2007), each showing different shrinkage in drying (; ). Microporous materials have a low shrinkage rate during drying due to very small pores and slow migration and evaporation of water. Shrinkage occurs mainly at the microscopic level of the material and the overall size change may not be significant. Mesoporous materials evaporate water more quickly from larger pores when drying, which can lead to more pronounced macroscopic shrinkage. Due to the heterogeneous nature of the pore structure, shrinkage may result in uneven changes in the material structure, such as cracking or deformation. Macroporous materials evaporate water rapidly due to their large pores, which leads to rapid and significant macroscopic shrinkage. Under rapidly drying conditions, macroporous materials may develop large internal stresses, leading to cracking or structural damage. Porous materials can be categorized into organic and inorganic porous materials based on the source or manufacturing method (). Organic porous materials may exhibit a higher degree of flexibility and elasticity during drying, thereby reducing the risk of cracking. Inorganic porous materials may be more fragile during drying and prone to cracking or structural damage. Porous materials can be categorized based on surface area as low surface area porous materials, medium surface area porous materials, and high surface area porous materials (; Zdravkov et al., 2007; ). High-surface-area materials may experience greater internal stresses upon loss of moisture due to surface tension within the pores, resulting in more significant shrinkage. Medium surface area materials may have better structural stability during drying compared to high surface area materials. A low surface area usually means that the pores are larger or fewer in number, so these materials may exhibit less shrinkage during drying.
2.2 The effect of cell structure on material shrinkage
The structural stiffness of cellular tissues can prevent shrinkage during drying, and the structural stiffness often depends on the distribution and transport mechanism of water inside cells (). The water transport rate is related to cell size, direction, and type of cell water in the sample (). The porous materials generally contain free water (FW) and bound water (BW) (; ), as shown in Figure 2. FW exists in intercellular space, and BW can be divided into loosely bound water (LBW) and strongly bound water (SBW) based on fluidity. Bound water present in cells is called LBW, while cell wall water is called SBW.
FIGURE 2
According to reports, the migration of FW has a limited impact on material shrinkage, while the migration of BW during drying has a strong effect on material shrinkage. indicated that migration of LBW resulted in cell shrinkage, pore formation, and cell structure collapse, while migration of SBW resulted in deformation of the entire material structure. found that vacuum-steam pulsed blanching (VSPB) could enhance the transfer of water within the material structure. Subsequently, Wang et al. (2021) used VSPB to treat carrots, and the results showed that the content of BW in carrot tissues decreased with the increase of blanching times. The migration of water in the material cells can promote the drying process and improve efficiency, energy saving, and emission reduction for the drying industry.
Understanding the period at which cell membranes break is also crucial, as this knowledge can be used to design more efficient drying systems. believed that the cell membrane of the material tissue collapsed simultaneously in a certain period of drying, thus resulting in the deformation of the whole tissue. In contrast, , and have found that cell membranes rupture at different stages of the drying process. The main factors of cell rupture depend on the rate of heat energy penetration and the pressure gradient generated in the cell tissue.
In addition, tissue shrinkage depends on the characteristics of the cell walls of the tissue (). studied the cell wall characteristics of the Granny Smith Apple (GSA) and Red Delicious Apple (RDA) under convection drying. Table 1 displays the cell wall thickness for GSA and RDA in both fresh and dry states. The table reveals that the cell walls of RDA are thicker when they are fresh, while dried RDA cell walls show a greater degree of contraction than those of GSA. This suggests that RDA contains more bound water within its cell walls compared to GSA, resulting in a greater energy requirement for drying due to the thicker cell walls. presented Scanning Electron Microscopy () images of apples at varying stages of drying, shown in Figure 3. It can be observed from Figure 3 that the shape and size of the cells gradually change with the decrease of water content during the drying process, and cell wall wrinkling and cell contraction can be observed. The quality of dried food, especially physical properties such as porosity, shrinkage, and microstructure, is significantly affected by cell wall characteristics.
TABLE 1
| Granny smith apple (GSA) | Red delicious apple (RDA) | |||||
|---|---|---|---|---|---|---|
| Cell wall thickness | Cell wall thickness | |||||
| Fresh (μm) | Dried (μm) | Cell wall shrinkage coefficient | Fresh (μm) | Dried (μm) | Cell wall shrinkage coefficient | |
| Avg | 9.312 | 4.685 | 49.69% | 11.405 | 2.432 | 78.68% |
| Min | 6.734 | 3.769 | 44.03% | 7.678 | 1.65 | 78.51% |
| Max | 11.785 | 6.281 | 46.70% | 14.458 | 3.527 | 75.61% |
Cell wall thickness of fresh and dried apple.
FIGURE 3
2.3 Effect of drying conditions on material shrinkage
The shrinkage of materials in the drying process is affected by drying parameters (drying temperature, drying airspeed, and relative humidity of drying air), among which drying temperature and drying air speed are the most important drying parameters that affect the shrinkage of materials (; ). These drying parameters will be discussed below.
The drying temperature plays an important role in increasing the drying speed and thus saving energy. Numerous studies have shown (; ) that the drying temperature has a significant effect on the shrinkage of the material. Zzaman et al. (2021) applied immersion pre-treatments and different drying temperatures to improve the overall quality of pineapple slices. The results showed that higher drying temperatures greatly enhanced the drying rate, which helped to maintain the physicochemical characteristics of the glass. studied the effect of different parameters (drying temperature, drying airspeed) of a convection hot air dryer on the drying characteristics of thinly sliced pears. Figure 4 represents the variation of surface shrinkage of pear slices with drying temperature and air velocity during drying. It is obvious from the figure that the percentage of pear layer shrinkage increases with the increase of drying temperature and air wind speed. The main reason for this phenomenon could be the decrease in viscoelastic stress within the cells due to the loss of water, which reduces the pressure between the internal cellular tissues (; ). Different drying temperatures have different effects on the shrinkage rate of materials, and the choice of drying temperature is not the higher the better. McMinn and Magee () and Wang and Brennan (Wang and Brennan, 1995) showed that potato tissues shrink less at high temperatures (70°C) than at low temperatures (40°C). This phenomenon may be due to the shell hardening effect occurring in the material at high temperatures leading to the transport of water, which ultimately controls the shrinkage of the material (). Therefore, drying temperature is an important influencing factor for material shrinkage, and choosing the right drying temperature is crucial for drying rate as well as energy saving.
FIGURE 4
The drying air velocity is also another important factor affecting the shrinkage of materials during the drying process (Ziari et al., 2022). used the heat-mass transfer coupled with a stress-strain mathematical model to analyze the thermal and moisture stress profiles of apple slices at different air speeds (drying temperature of 60 C). The results of the study showed that the greater the hot-air velocity corresponds to the greater the drying stress (thermal and moisture stress), resulting in greater drying shrinkage deformation. The relevant literature (; ) has similar conclusions. This phenomenon may be because the boundary layer as the surface resistance of the material decreases with increasing air velocity, which results in relatively flat moisture within the tissue leading to low internal stresses and eventually leading to uniform shrinkage of the material at lower drying air velocities.
Related studies have shown that the drying temperature has a greater effect on the shrinkage of porous materials than the drying air speed (; Wu et al., 2019). Therefore, it is very important to consider the drying temperature for the dried products.
2.4 Effect of glass transition temperature on material shrinkage
The glass transition temperature (Tg) is very important in the processing of materials, especially during the drying process. The temperature at which the amorphous water of the porous material changes from the rubbery state to the glassy state during the drying process is called the glass transition temperature (Tg) (). In the glassy state, the high viscosity of the matrix leads to extremely slow molecular mobility (). Therefore, Tg can be used as a reference parameter for characterizing the quality, stability, and safety of food systems ().
The shrinkage process of the material during drying is theoretically explained by the glass transition temperature (; ). demonstrated the non-size moisture content and Tg of radish and potato tested using DSC at drying temperatures below 40°C and 50°C, respectively, as shown in Figure 5 (). The maximum glass transition temperatures of radish and potato are 24.9°C and 53.8°C, respectively. Since the drying temperature (<50°C) of radish is lower than Tg, the shrinkage deformation of radish is not affected by the glass transition. On the contrary, the Tg of potatoes was higher than the drying temperature in the later stages of drying, which indicates that potatoes gradually vitrify locally as drying proceeds. Finally, this author concluded that the glass transition phenomenon in the potato core significantly reduces the shrinkage rate. When the drying temperature of the material is higher than Tg, the material remains in a rubbery state. The material has a higher molecular mobility and higher rubber-like shrinkage compared to the glassy material. Therefore, when the drying temperature is lower than Tg, the material appears in a high viscosity state and this phenomenon leads to a reduction in shrinkage of the glassy state ().
FIGURE 5
3 Drying model for porous materials
Drying of porous materials is a very complex operation that requires a lot of effort and time. Experimentation is the backbone of the drying technology research and development process. However, relying solely on experimental drying practices without considering the mathematical considerations of drying kinetics can significantly reduce the efficiency of the dryer and increase production costs (Wehbe et al., 2009; ).
The currently available drying models can be classified using the scale approach (; ; ), which are macro-scale models, micro-scale models, and multi-scale models, as detailed in Figure 6. Macroscale models treat the material as a continuum and do not consider the interactions between materials internally (). Microscale models treat tissues as heterogeneous, with complex cellular structures represented by geometric models (). Microscale models can provide tissue deformation and local distribution of moisture at the cellular level, while macroscale models can represent the overall drying characteristics (). Therefore, to predict the whole drying process of porous materials, the macroscopic model and the microscopic model can be coupled, and the coupled model is also the multiscale model.
FIGURE 6
3.1 Macroscale model
The general assumptions of the macroscopic model are as follows: (1) the porous material is considered a continuum, meaning that the material’s properties do not change when the material’s internal organization is subdivided. (2) Mass transfer within the solid occurs by diffusion and water evaporation occurs only between the material surface-air, so there is no phase change within the material (; ). This class of model is used to characterize the drying of porous materials, including drying time, mass and heat transfer, and energy consumption (; ; ).
The theoretical models can be divided into single-phase model and multiphase model. The single-phase model assumes that diffusion drives moisture migration, but only considers mass transfer and conduction as energy transfer mechanisms without accounting for other important drying properties (; ). The multi-phase model considers the coupled three-phase mass and heat transfer of liquid water, gas, and solid in the drying of porous materials. Thus it can provide a relatively realistic understanding of the heat and mass transfer process (; ).
Semi-theoretical models are generally obtained based on the solution of Fick’s second law and the variation of its simplified form. They are developed by relying on physical phenomena that occur during experiments, so they are easier to apply and have fewer assumptions. The empirical model and semi-theoretical model have similar characteristics ().
Empirical and semi-theoretical models are largely dependent on experimental data and offer restricted insights into product drying characteristics (; ). Theoretical models not only consider the external and internal resistance of water transfer but also the shrinkage rate, geometry, porosity, and conductivity of materials (; ). However, there are many limitations to assumptions.
3.2 Microscale model
The micro-scale model can include the transport phenomena of different components at the microscopic scale, such as cell walls, cell membranes, cell vacuoles, pores, etc. The model accounts for the anisotropy of the material, and since the geometric model indicates the cell structure of the material, its organization changes as it is subdivided (; ). To better understand the potential phenomena leading to water loss of materials, Fanta et al. () established a micro-scale water transport model combined with the microstructure deformation and calculated the effective conductivity of pear skin tissue. The results show that the membrane has the greatest influence on the surface macroscopic water conductivity. established a meshless particle microscopic model through smooth particle fluid dynamics (SPH) and discrete element method (), which can deal with the extreme deformation of cell tissues during drying. Rahman () established a micro-scale drying model based on real cell geometry to study the effects of drying conditions on the horizontal transport and deformation of porous material cells. used the locally exact homogenization theory to reveal the influence of the transfer mechanism of heat conduction at the microscopic interfaces of porous materials on the material properties. established a micro-scale heat transfer analysis model based on thermal parameters and boundary conditions of composites using Abaqus finite element analysis software. The local temperature distribution of composites under different heat transfer conditions was analyzed by this model.
In the development of existing microscale models, many of the assumptions of microscale models are based on the circular cell structure and lack the assumptions of real cell shape. As a result, the relationship between the space between cells and the transport process during the drying process is not strong, which leads to inaccurate prediction results. Therefore, it is necessary to develop a model based on plant microstructure to correctly analyze the transport process.
3.3 Multiscale model
Multi-scale modeling is a comprehensive method combining macro - and micro-scale. It can describe macroscopic scale phenomena by physical properties obtained in the microscopic environment, and at the same time consider the uncertain influence within micro-organization (). Coupling geometric features at the micro-scale with conservation equations at the macro scale shows great potential in predicting the depth and precision of material properties (). Multi-scale models have been widely used in various research fields because of their advantages of inferring macroscopic properties from micro-scale structures (; ). The drying of porous materials can be regarded as a phenomenon of heat and mass transfer coupled with multiple physical fields, which is very suitable for multi-scale modeling ().
Multi-scale modeling is an effective method to better understand the water migration in tissues and the mechanical properties of porous materials during drying. predicted sample shrinkage, surface deformation, and effective water diffusion during isothermal drying by using a moving boundary model that considered the reduction of microstructure volume of food materials during drying. Welsh et al. (2021a) developed a multi-scale drying model for apple drying, which considered the effective water diffusivity when water distribution was uneven during the drying process. In this work, predetermined temperatures are used to determine microscale mean diffusion coefficients. Subsequently, the author (Welsh et al., 2021b; Welsh et al., 2023) further extended the multi-scale modeling method by considering the effects of cell rupture in the micro-scale domain as well as in the macro-scale, overcoming the dependence of the previous model on the mean diffusion coefficient and predetermined temperature. It provides a new insight for considering the heterogeneous distribution of water by using the change of microstructure. established a physics-based transfer model to predict the temperature, moisture content, and shrinkage rate in the drying process of low-temperature air. And the author also improved the model through an artificial neural network () model. established a multi-scale model to simulate heat transfer in the drying process of granular materials. The results show that the simulation of isothermal particles is closer to the experimental data than that of non-isothermal particles. used a three-dimensional particle model to consider intraparticle heat transfer, the interaction between particles, interphase momentum, heat transfer, and other multi-scale phenomena. The research results showed that particle shape, particle size, and operating conditions all had an impact on biomass pyrolysis. Such studies provide some insights into the pyrolysis kinetics of biomass.
As the model scale decreases, the accuracy of the multi-scale model increases gradually. However, the simplicity and generality of the model are often at odds with the approximation of the real micro-structure. Multi-scale models often have a complex solution process, which is the biggest challenge in the development of multi-scale models. Therefore, promoting the development of multi-scale modeling should focus on reducing the modeling difficulty and computational cost, and then meet the requirements of different accuracies in different studies.
4 Morphological simulation of porous materials
Porous materials have complex physiological features, geometric morphology, and optical properties. Therefore, the morphological modeling and visualization of porous materials remain one of the most challenging tasks in the simulation of realistic natural scenes. The work related to the simulation of plant leaves is mainly divided into computer graphics modeling and biological modeling.
4.1 Computer graphics modeling
The more representative approaches in computer graphics modeling are Lindenmayer systems (L-systems), image-based modeling, and particle systems, respectively.
The L-system was proposed by the American biologist Aristid Lindenmayer in 1968 (). The method consists of a syntactic system of string rewriting rules. The rules replace each character in the string with the subsequent symbol in parallel, which in turn produces the next string, and the process iterates (). In the L-system, each string describes a step in the simulation. Also, each character may have one or more rewriting rules, and each rewriting rule is useful for modeling and simulating plants. The main function of this method is to describe plant topology or plant growth processes using a formal language approach ().
The image-based modeling is mainly based on the plant pictures provided by the user. proposed a semi-automatic leaf modeling method to model plant leaves. The method first creates a point cloud using plant images taken from different angles provided by the user. Then, the individual leaves are segmented using the image information. Finally, the segmentation is manually refined to avoid errors due to overlapping leaves. This method is more dependent on the image attributes provided by the user.
The venation pattern of the particle system is established mainly through the particle distribution track. proposed a particle transport algorithm to simulate the complex vein structure. The algorithm randomly applies particles to the blade, each of which has energy, and points each particle toward the target through transmission rules. When particles get close to each other, they bond to each other to form trajectories that create vein patterns.
4.2 Biological modeling
The curl deformation of plant leaves during drying has a great influence on the transportation, preservation, and quality of processed products. For the modeling of plant leaves, relevant researchers use various modeling methods to analyze the overall geometric structure of leaves, including veins and leaves.
For vein modeling, proposed an interactive modeling method to establish the three-dimensional skeleton of the vein. The method is based on leaf scanning images, interactive construction and modeling of the skeleton, and automatic generation of membrane mesh. Figure 7 shows the morphological changes of blade aging simulated by this method. The main disadvantage of this method is that it is highly dependent on the leaf attributes provided by the user and neglects the biological and physical principles in the process of plant deformation.
FIGURE 7
By taking into account the biology and physics of plant growth or dehydration, the researchers created a more realistic two-dimensional simulation of leaf veins. designed a contour-based method to model leaf veins. This method can use the growth information detected in the binary image of leaves to model the growth of leaf veins. modeled the growth process of leaf veins through the biological drive method. proposed a biologically motivated method to simulate the generation of different levels of blade pulse systems. Figure 8 Shows simulations of various leaf types using this method, including different vein patterns and complex leaf shapes. However, these simulations are simulations on a two-dimensional plane.
FIGURE 8
The 3D morphological modeling of plants can more accurately analyze the morphological structure and deformation of plants (; ). However, due to the complex morphological structure of plants, 3D modeling of plants is still a challenging issue (Zhao et al., 2019; Yang et al., 2020). The relevant researchers (; ) realized 3D modeling of wheat leaves through skeleton-driven methods, which also combined the curling and twisting characteristics of wheat leaves. Although the main topological structure of the blade is retained, the simulation of the three-dimensional morphological characteristics of the blade requires many control points, especially the crimp and twist characteristics of the blade ().
For blade deformation simulation, many studies have made many attempts to improve the efficiency of deformation simulation. Xiao and Chen, (2011) based on the observation of shrinkage stress field, which can simulate the morphology of leaves after drying well. However, the biological principles were not considered. In addition, the article showed that the greater the aspect ratio of different leaves, the greater their curvature after drying. Similar conclusions were found in related literature (; ). proposed the principle of a two-layer mass-spring model, in which both the leaf vein and leaf flesh models are two-layered. Since the leaf vein and flesh models contain many masses and springs, it leads to a more complicated calculation of this algorithm. developed a model based on Fick’s law and stress-strain relationship to illustrate the leaf curl pattern. The simulation results showed that the curling deformation of leaves was more pronounced for thickened leaves or high drying temperatures. proposed an algorithm for simulating dehydration crinkle deformation of plant leaves based on cellular dynamics and time-varying external forces.
5 Drying process for porous materials
5.1 Drying technology
Different drying techniques can be used for material dehydration, such as microwave drying (MD), hot air drying (AD), vacuum drying (VD), freeze-drying (FD), infrared drying (ID), etc.
Microwave drying technology allows for rapid evaporation of water during the drying process of materials, which provides shorter drying times and thus reduced energy consumption during the drying process compared to other drying methods. Compared to hot air drying, products dried by this technique have the advantages of greater shrinkage, faster water absorption, and lower rehydration capacity (). Related studies have shown that microwave output power has a significant effect on the drying time as well as the drying rate (; ). The drying rate of the product increases with the increase of microwave output power. On the contrary, the color of the product after drying is not related to the microwave output power. In summary, microwave drying technology offers significant advantages in terms of speed, energy efficiency and quality retention, but it also faces challenges in terms of cost, technical complexity and safety.
The biggest advantage of hot air drying technology is the controllability of the drying process. This technology allows artificial control of process parameters such as drying temperature, drying time, and air velocity during the drying process (). Hot air drying can cause degradation or deformation of the material due to the high temperature applied to the material (). The drying temperature in hot air drying affects the drying time, shrinkage rate, and color of the product (Zhang et al., 2017; ).
Freeze-drying techniques require very low pressure or high vacuum to produce good drying rates. Due to the low-temperature conditions, most deterioration and microbial reactions are prevented, resulting in a high-quality product (; ). In addition, the solid state of water in the tissue during freeze-drying protects the main structure and shape of the product, which in turn leads to a reduction in shrinkage (). Despite its many advantages, freeze-drying is considered to be the most expensive of all drying techniques.
The main advantages of the infrared drying process are fast heating, fast drying speed, uniform product temperature, high controllability of drying process parameters, eco-friendliness, etc. (; ) At the same time, the technology also has some limitations, such as the low penetration depth of infrared radiation () and the long infrared exposure time that hurts the final product color (Wang et al., 2014).
Vacuum drying is characterized by high drying rates and lower drying temperatures. These features provide better sensory and nutritional properties to the product (Wu et al., 2007). However, vacuum drying can lead to shrinkage of the product during drying, resulting in low porosity and brittleness (; ).
5.2 Hybrid drying technology
Hybrid drying technology is a combination of two or more different drying processes. By combining the advantages of different drying methods and reducing the limitations of each method. This results in lower energy requirements and shorter drying times, while maintaining product quality attributes such as flavor, nutrition, aroma, texture, color, (; ; Zhang et al., 2022) etc., Hybrid drying techniques have been shown to have lower energy consumption (; ).
5.2.1 Microwave-assisted drying technology
Microwave-assisted drying often used in industrial production are microwave-assisted hot air drying, microwave vacuum drying, and microwave freeze-drying, respectively. Due to the advantages of traditional hot air drying such as low investment cost and ease of operation, it is used in 85% of industrial drying operations. But there are some limitations of hot air drying. However, some limitations of hot air drying, such as long drying time and high drying temperature can lead to the loss of some nutritional values of the product (), dramatic changes in product structure after drying (), and changes in product color and flavor (). Microwave drying accelerates the transfer of moisture from the inside to the outside of the product, greatly reducing the drying time. Therefore, microwave-assisted hot air drying can overcome the limitations of long drying time in hot air drying, and thus improve the drying rate and quality. indicated that microwave-assisted hot air drying retained most of the bioactive molecules of the samples and reduced the loss of volatiles during drying, thus reducing the loss of nutritional value of the product. showed that microwave hot air drying exhibited higher drying rates and shorter drying times relative to other drying methods, and no swelling was observed on the samples.
Vacuum drying has a long drying time due to the absence of hot air. On the contrary, the microwave is the most efficient way to transfer energy and is the shortest drying time of all drying systems. Therefore, microwave vacuum dryers can improve the drying rate and quality of products. used a microwave vacuum dryer to dry garlic slices and investigated the effects of microwave power, vacuum, and temperature on the drying characteristics and quality of garlic slices. Studies have shown that compared to hot air drying, microwave vacuum drying can increase the drying rate, improve the quality of dried garlic chips, and consume less energy than vacuum freeze drying. developed a novel in situ measurement method for microwave vacuum drying that avoids the removal of samples from the vacuum drying chamber. It was found that decreasing the moisture content increased the drying rate when potato and radish samples reached a critical moisture content before they were dried.
The main limitation of freeze drying is the limited heat transfer rate and the absence of a constant drying period. Since water is frozen rather than liquid, this results in a poor heat transfer rate from the outside to the inside of the frozen material. In contrast, microwaves heat the material in a volumetric manner to avoid this localization. Therefore, microwave freeze drying can avoid the limitations of a single drying technique. showed that microwave freeze drying reduced the drying time by 14.29%–35.71% compared to conventional hot air drying. In addition, microwave freeze-dried products were superior to hot air drying in terms of color, water/oil absorption capacity, and solubility. conducted drying for pineapple slices and showed that microwave freeze drying saved 34.5% of energy consumption and 33.3% of drying time compared to vacuum freeze drying.
5.2.2 Infrared radiation-assisted drying technology
Infrared drying uses infrared radiation as a heat source, thereby increasing the drying temperature and promoting the evaporation of moisture from the product. Infrared radiation has been widely used for drying materials in combination with other drying processes.
Compared with traditional drying methods, the infrared-assisted hot air drying method increases the drying rate of the product while reducing the energy consumption required to dry the product (; ). designed an infrared-assisted hot air dryer for drying turmeric tablets. The results of the study showed that the drying rate of infrared-assisted hot air drying was twice as high as that of infrared drying and hot air drying. showed that IR-assisted freeze-drying shortens drying time and retains more flavor of quinoa compared to freeze-drying. In contrast to the steaming method, IR-assisted freeze-drying did not destroy the crystalline structure of the starch in raw quinoa and thus could maintain the paste state of the quinoa samples well. created a novel combined drying technique, infrared-assisted tilted tray air impingement drying (IR-TTAID), for drying kiwifruit slices. Compared with TTAID, IR-TTAID reduces the drying time of products by 35.71%–58.33% and energy consumption by 5.96%–27.92% and also obtains higher quality dried products. Zhu et al. (2021) used infrared-assisted spout bed drying for whole peanut fruit (IR-SBD) and compared it with hot air drying and infrared drying. The results showed that the drying time of IR-SBD was reduced by 66% and 32% compared to HD and ID, respectively. The fatty acid content in IR-SBD dried samples was reduced by 4.07% compared to fresh peanut samples.
5.2.3 Solar-assisted drying technology
Since solar energy is a renewable, green, and clean energy source, it is one of the most important applications of solar energy. However, solar dryers are virtually unusable under cloudy skies and have limited control over drying conditions. To overcome this limitation, solar dryers are combined with other energy sources. The technology is called Hybrid Solar Dryer. Hybrid solar drying technology can combine the advantages of solar energy to improve the quality as well as the speed of drying the product.
In recent years, solar drying has been complemented by various traditional drying technologies (; ), such as heat pumps, microwaves, and vacuums. proposed a novel solar-assisted heat pump (SAPH) for drying grain in grain silos. The operating cost of SAPH grain drying was reduced from $5.57/ton to $1.43/ton compared to conventional dryers. developed a hybrid solar vacuum dryer to dry food. This dryer uses solar collectors to provide electrical energy and conductive multiple flash drying (KMFD) for food dehydration. This technology allows you to obtain high-quality dry and crisp products in a short time. Yahya et al. (2017) developed a hybrid solar fluidized bed dryer to dry rice. The dryer uses solar collectors and a heat exchanger with a biomass furnace to heat the drying air.
6 Conclusion
In this paper, the main factors affecting the shrinkage characteristics of porous materials are discussed, the drying theory and deformation simulation of porous materials are summarized, and the drying techniques used in industrial drying products are summarized. The following conclusions can be drawn:
1) The water migration within the cell structure and the characteristics of the cell wall have a great influence on tissue shrinkage. Compared with drying wind speed and drying humidity, drying temperature has more influence on the drying shrinkage of materials. When the drying temperature is lower than the Tg, the material appears in a high-viscosity state, which ultimately leads to the reduction of shrinkage.
2) Relative to macro-scale models and micro-scale models, multi-scale models are an effective approach in drying models. However, the biggest challenge in the development of multi-scale models today is to reduce the modeling difficulty and computational cost, and thus meet the requirements of different accuracy in different studies.
3) Most studies of computer graphics simulation have focused on plant growth simulation. On the contrary, many studies have simulated the deformation of the plant drying process by biological modeling. However, there is a lack of simulation of the drying deformation of porous materials from a mechanical point of view.
4) Different drying techniques for porous materials each have their pros and cons. Hot air drying is easy and cheap but might deform some materials. Microwave drying is quick and saves energy, yet can dry materials unevenly. Freeze drying preserves material structure, ideal for sensitive materials, but it is slow and uses a lot of energy. Infrared drying is fast and efficient, with good quality control, but faces issues with even heating, cost, and safety. Vacuum drying works well for heat-sensitive materials at lower temperatures, though it is expensive. Overall, choosing the right drying technology needs to be based on the specific characteristics of the porous material and the needs of the application.
According to the characteristics and properties of dried products, the influencing factors of porous materials in the drying process are studied, and the selection of suitable drying theory and drying equipment is a decisive factor affecting the storage of dried products as well as energy utilization.
Statements
Author contributions
JL: Conceptualization, Writing–review and editing. YH: Conceptualization, Writing–original draft. MG: Writing–original draft. JT: Conceptualization, Data curation, Formal Analysis, Writing–review and editing. GW: Conceptualization, Writing–original draft.
Funding
The author(s) declare that no financial support was received for the research, authorship, and/or publication of this article.
Conflict of interest
Authors JL and JT were employed by China Tobacco Zhejiang Industrial Co., Ltd.
The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
Publisher’s note
All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers. Any product that may be evaluated in this article, or claim that may be made by its manufacturer, is not guaranteed or endorsed by the publisher.
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Summary
Keywords
porous materials, energy conversion efficiency, shrinkage property, drying model, morphological simulation, drying technology
Citation
Li J, Huang Y, Gao M, Tie J and Wang G (2024) Shrinkage properties of porous materials during drying: a review. Front. Mater. 11:1330599. doi: 10.3389/fmats.2024.1330599
Received
31 October 2023
Accepted
08 February 2024
Published
21 February 2024
Volume
11 - 2024
Edited by
Ayrat Gizzatov, Aramco Americas: Aramco Research Center-Boston, United States
Reviewed by
Hongkui Zheng, University of California, Irvine, United States
Wei Zuo, Wuhan University of Science and Technology, China
Updates
Copyright
© 2024 Li, Huang, Gao, Tie and Wang.
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*Correspondence: Mengyuan Gao, 827785824@qq.com; Jinxin Tie, tiejinxin@zjtobacco.com
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