Thermal and entropy behavior of sustainable solar energy in water solar collectors due to non-Newtonian power-law hybrid nanofluids

Abstract

Introduction: Nanofluids, hybrid nanofluid possesses thermophysical features that boost the fluid performance. This research work is motivated by the utilization of water solar collectors that incorporate non-Newtonian, power-law hybrid nanofluid in a three-dimensional model, considering the two-phase model.

Method: The primary objective of this study is to transform the governing equations of the flow model into a set of ordinary differential equations by employing the three-parameters group technique. Based on the innovative discoveries, two models incorporating new associated functions have been successfully developed for two distinct scenarios characterized by the power-law index, n. The impact of physical factors on the velocity profile, temperature distribution, concentration field, and entropy output of the system is clearly illustrated through a variety of graphs.

Results: The results indicated that the inclination angle of 20° had the best thermal characteristics compared to other inclinations. The entropy generation reached its maximum value at temperature difference of 13 K due to irreversibility of the system, which indicates that the system is more efficient.

Discussion: Furthermore, the increasing percentage in Nusselt number is predicted to be 28.18% when the Prandtl number is taken a range. The Sherwood number enhanced up to 18.61% with a range of Brownian motion. A quantitative comparison is conducted between the present results and the literature in order to validate the superior efficiency of the used method.

1 Introduction

Solar energy is widely considered to be the most feasible solution for meeting the energy requirements of technical and industrial applications through the use of renewable sources. The world energy needs can be satisfied by solar energy that the Earth is exposed to. Solar radiation generates electricity or heat through chemical solar energy. Solar energy is well-recognized for its significant advantages, therefore making it suitable for various applications, including the utilization of solar collectors (SCs). Referring to Prado et al. (2016), a solar collector is a system comprising a heat exchanger, where solar radiation is absorbed and then converted into heat, which then transfers to a base fluid like water (H₂O) (Kalogirou, 2004; Ajeena et al., 2022). The base fluid travels through solar collectors to generate electrical energy for industrial applications. Industrial applications are space heating, refrigeration, and service hot water (Bellos et al., 2016). Solar energy application is classified into two categories: concentrated solar power and photovoltaics. The photovoltaic (PV) system utilizes solar cells to capture and convert solar radiation into electrical energy in a prompt manner (Jamshed et al., 2021a). The primary applications of photovoltaic systems encompass public lighting, such as billboards, highways, and parking lots (Slimene and Arbi Khlifi, 2020). Additionally, PV systems find utility in solar water pumps and the amplification of signals in wireless communication networks (Cano et al., 2021). On the other hand, concentrated solar power (CSP) systems utilize mirrors (reflectors and lenses) to collect Sun’s rays. As a result of this, a liquid substance is heated, causing a heat engine to work. High-power generation and decreases in the energy demand, consumption, and cost are only a few of the ways in which thermal energy storage technologies contribute to the efficiency of CSP systems (Freund et al., 2021).

Several nanoparticles are mixed together in a single fluid to create a hybrid nanofluid. Recently, the study of hybrid nanofluids have been deeply investigated to replace conventional base fluids (Qureshi, 2021; Jamshed et al., 2022a; Imran et al., 2022; Shahzad et al., 2022). A considerable proportion of researchers choose to focus their attention on the examination of heat transmission in hybrid nanofluids. The wide range of applications encompasses gas turbines, thermoplastic coatings, condensation, medical equipment, and computer storage systems (Dawar et al., 2022). Hybrid nanofluids (HNFs) exhibit high thermal conductivity that is helpful in improving the Solar System efficiency and optical properties (Tiwari et al., 2021). In contrast, magnetohydrodynamics (MHD) is an interdisciplinary field that integrates principles from the electromagnetic theory and fluid mechanics. The utilization of magnetohydrodynamics finds its application in diverse technical and industrial sectors, including but not limited to the petrol industry, MHD power generators, nuclear reactors, the control in aerodynamics, and magnetic mixers (Sheikholeslami et al., 2016). The investigation conducted by Imran focused on the analysis of the two-dimensional unsteady hybrid nanofluid around a deformable and horizontally moving porous plate (Imran et al., 2022). Jamshed et al. (2022a) studied unsteady hybrid nanofluids over a parabolic trough solar collector to enhance the activity of a solar aircraft. Dawar et al. (2022) adopted the homotopy analysis method to analyze the flow of the nanofluid for an inclined thin layer which is subjected to incident solar energy. Aljohani et al. (2023) employed a model to elucidate the behavior of an absorption solar collector. Their results led to the fact that an increase in the inclination angle γ resulted in a reduction of the velocity profile. Shahzad et al. (2022) used mathematical techniques to investigate the heat transmission phenomena in a solar-powered ship. Ghasemi and Hatami (2021) analyzed the effect of solar radiative energy on the two-dimensional model of a nanofluid around a sheet. Using a solar collector plate, Farooq et al. (2022) investigated the bioconvection flow performances of viscoelastic nanofluids in three dimensions (3D). Munir et al. (Farooq et al., 2020) presented the entropy generation of the 3D flow of the nanofluid over a moving plate subjected to an induced magnetic field. According to Sajid et al. (2021), solar aircraft wings show better performance in terms of heat production, viscous dissipative flowing, and thermal radiation. Ibrahim and Gizewu (2023) introduced an analysis of entropy generation over a curved stretching surface.

Krishnamurthy et al. (2016) investigated the effects of chemical reaction and radiation on nanofluids through a horizontal stretching sheet. Gireesha et al. concentrated, in his study, on the constant flow of nanofluids over a stretched surface in a two-dimensional setting, considering the influence of a magnetic field (Gireesha et al., 2016a). In another work, Mahanthesh et al. (2017) used the Eyring–Powell fluid to analyze the unsteady flow in a three-dimensional overheated surface in the existence of Joule heating. In their study, Mahanthesh et al. (2016) utilized a model to investigate the characteristics of the MHD nanofluid over a stretching surface, considering the impact of viscous dissipation. Gireesha et al. (2016b) examined the influence of Hall current and the thermal effect on the heat transfer characteristics of a dusty viscous fluid flowing over a permeable stretched sheet. Madhu et al. (2022) employed the finite element method to investigate the thermal analysis of an Eyring–Powell fluid within a microchannel. Khan et al. (2018) employed a two-dimensional model to obtain the entropy generation of the nanofluid flow on a stretching sheet in the existence of the magnetic field. Rehman et al. (2017) examined the MHD nanofluid in the 3D flow between the horizontal plates. Ijaz Khan et al. (2018) defined the entropy generation of the convective nanoliquid flow around a permeable surface. The same authors studied the heat and mass transfer of the Maxwell fluid toward the stretching plate in Khan et al. (2017a). Javed et al. (2018) used the shooting method to analyze the axisymmetric flow of a fluid over a cylinder. Azam et al., 2019) conducted numerical simulations to investigate the characteristics of the unsteady MHD fluid of a nanofluid subjected to thermal radiation. Rashed et al. (2022a) analyzed the axisymmetric forced flow of the nanofluid over a heated cylinder. Ghadikolaei et al. (2018) studied convection in the MHD flow of the Casson nanofluid over an inclined porous sheet. Khan et al. (2015) employed the shooting approach to examine the nanofluid flow in two orthogonal directions across a non-linearly stretched sheet. Rashed et al. (2021) investigated the characteristics of a nanofluid around a vertical plate, taking into account the variability of both the thermal and Brownian diffusion coefficients. Rashed et al. (2020a) scrutinized a mathematical model to analyze the different types of nanofluids over cylindrical solid pipes.

Ghadikolaei et al. (2018) obtained some results concerning the increase in the inclination angle which causes the decrease in the nanofluid velocity and the temperature profile to rise. Jamshed et al. (2021b) stated that when the power-law index increases, the velocity of the nanofluid increases, while the temperature distribution decreases. Moreover, the same author proved that the temperature profile was enhanced for higher values of the radiation parameter . Ghasemi and Hatami (2021) reported that the thermophoresis parameter has a tendency to enhance the concentration profile, while the parameter of Brownian motion has an opposing effect on it. Imran et al. (2022) stated that entropy production increased with the enhancement of the Brinkmann parameter and Reynolds number for the (ZrO₂–Cu/engine oil) hybrid nanofluid. Qureshi (2021) reached the conclusion that increasing the magnetic field, Brinkman number, and Reynolds number for a nanofluid increases the entropy of the system. Sharma et al. (2023) mentioned that the rate of entropy enhances with the increment of the Prandtl number and diffusive variable. Sahoo and Nandkeolyar (2021) observed from the graphs that there is a significant increase in entropy generation for larger values of the concentration ratio parameter and diffusive variable. Furthermore, a contrary observation can be illustrated against the magnetic parameter and the temperature ratio parameter. The singular manifold approach and Lie infinitesimals, for example, are used to solve evolution equations (Saleh et al., 2021; Rashed et al., 2022b) and fluid dynamic applications (Rashed, 2019; Rashed et al., 2020b; Rashed et al., 2023), respectively.

This interest in a solar collector is because of its several applications, like in a solar power ship, collector storage, aircraft wings, solar furnaces, and thermal power systems (Kalogirou, 2004; Afzal and Aziz, 2016; Jamshed and Aziz, 2018). The non-Newtonian fluid has many applications, like biomedical flows, lubrication, fluid friction, and central cooling and heating systems (Hoyt et al., 1999). Furthermore, the hybrid nanofluid has various practical, technical, and technological uses, including its use in radiator systems, nuclear systems, and the cooling of electronic components (Jamil et al., 2020).The hybrid nanofluid incorporates copper (Cu) and ferro (Fe₃O₄) nanoparticles suspended in a water (H₂O) base fluid. Consequently, this research is more useful for the field of heating water, heat transfer, and thermal energy storage. Based on the aforementioned literature review (Afzal and Aziz, 2016; Jamshed and Aziz, 2018; Jamshed et al., 2021b; Farooq et al., 2022), the present study is focused on investigating the thermal and entropy behavior of a three-dimensional flow of a hybrid nanofluid within a solar collector, specifically under the influence of a magnetic field. The cases of operation are obtained by considering the effect of the power-law index. Therefore, this study could improve industrial production, particularly in a solar energy collector.

2 Mathematical formulation

This study focuses on conducting a mathematical analysis of a non-homogeneous hybrid nanofluid within a solar collector. Owing to this study, it is assumed that the laminar boundary layer exhibits three-dimensional characteristics, is in an unstable condition, and possesses non-Newtonian behavior. Moreover, the inclusion of thermophoresis and Brownian motion is considered in order to address the limitations to the single-phase model. In order to optimize flow regulation, an external magnetic field has been implemented in the z-direction. The provided diagram, shown in Figure 1, illustrates the geometric configuration of the model. The mathematical model for the flow can be expressed by the following formula (Bhatti et al., 2016; Sheikholeslami and Ganji, 2016; Sheikholeslami and Rokni, 2017; Ghobadi and Hassankolaei, 2019; Jamshed et al., 2021c; Dawar et al., 2022; Algehyne et al., 2023; Sharma et al., 2023):where denote the velocity components in the three dimensions, stands for the temperature, the concentration of nanoparticles is represented by , t refers to time, is the Brownian diffusion coefficient, and denotes the thermophoresis coefficient. Here, the related boundary conditions become the following (Khan et al., 2015; Khan et al., 2017b; Azam et al., 2019; Imran et al., 2022):

FIGURE 1

One of the typical solar collectors is used in this research, and the dimensions are given hereafter in Table 1 (Lakhdar et al., 2019; Dhaundiyal and Gebremicheal, 2022).

The velocity components and temperature in the normalized form are introduced as follows (Sojoudi et al., 2014):

As a result, Eqs 1–5 are rewritten as follows:

The related boundary conditions are as follows:

3 The group transformation method in three parameters

By employing group transformation, we proceed to examine the system of Equations 9–13. Upon a closer examination of the similarities, the governing PDEs undergo a transformation, resulting in a set of ODEs. One of the main benefits of the GTM approach is its ability to efficiently convert systems of PDEs with varying numbers of variables into systems of ODEs.

3.1 Group systematic formulation of the system

The definition of the group containing three parameters is given by the following:where the symbol, S, refers to the variables of the system, and denote the coefficient function to be differentiated, and the three parameters are, and . The partial derivatives are defined as follows:

3.2 Invariance analysis of the system

The transformation of Equation 9,takes the form of equivalence, where is an equivalence parameter.

Substituting (16) and (17) into (18) leads to the following:which is simplified as follows:

The invariance of (9) reveals that implies the following:

Similarly, Eq. 10 can be transformed into the following:

Substituting (16) and (17) into (22) reveals the following:

Simplifying Eq. 23 implies the following:

The invariance of Eq. 10 reveals that which ensures that

Similarly, Eqs 11–13 can be transformed into the following:

The invariance of Eqs 11–13 implies the following:

The invariance of boundary conditions shows the following:

At the end of this analysis, the group of invariant transformations of systems (9)–(13) can be introduced in the following form:where and denote the group structures for independent and dependent variables.

3.3 The complete set of the invariant system

In this section, ODEs are derived from the governing equation by applying the Morgan theorem. Extending Morgan’s theorem (Moran and Gaggioli, 1969) results in achieving the invariant transformations of the system variables and for the three-parameter group that is listed as follows:where refers to the initial system variables and refers to the group of transformed variables. The variables are defined by the following relations:

3.3.1. Invariant transformation of the independent variables: x, y, z, and t

The transformation of the independent variables to a single similarity variable can be achieved by applying Equations 33–35:where will be defined later. The transformation of the dependent variables helps in obtaining the following similarity variables:

By employing the aforementioned transformations, the system of Eqs. 9–13 can be simplified to the subsequent system:

The functions and are precisely calculated to prove that Eqs 39–43 are defined by a similarity to the system of ODEs.

Two cases could be analyzed as follows:

Case-1:

As a result of this, the functions will be as follows:where a, b, and denote real-valued constants. Applying the attained results in (44), the systems of (39)–(43) can be written as follows:

Case-2:

The functions take the following form:

From the obtained results in (50), the systems of (39)–(43) will be as follows:with the related boundary conditionswhere the aforementioned parameters are the magnetic parameter, M; power-law index, radiation parameter, ; the angle of inclination of the solar cell, ; Prandtl number, ; Brownian motion parameter, ; Schmidt number, ; and thermophoresis parameter, , which are given in the following forms (Alaidrous and Eid, 2020; Sadiq, 2021):

The non-dimensional forms of the physical quantities are the Nusselt number, skin friction, and the Sherwood number, as shown as follows (Jamshed et al., 2021c; Jamshed et al., 2021d):

After that, the following correlations between the nanoparticle concentration in the base fluid and the hybrid nanofluid parameters are presented (Jamshed et al., 2022a):

Employing the MATLAB package, the obtained system of ODEs (45)–(49) is solved numerically with the same conditions as in (56). First, let

Using Eq. 60, we find the following:with the initial conditions

4 Analysis of entropy generation

The entropy outcome of the mathematical model can be characterized as follows (Farooq et al., 2020; Sahoo and Nandkeolyar, 2021):

The entropy generation non-dimensional form, , is defined as follows (Jamshed et al., 2021a):

Entropy generation in the dimensionless form has been rewritten based on Eqs 63 and 64, as demonstrated in the subsequent expression:where diffusive variable , dimensionless temperature ratio variable , and the dimensionless concentration ratio variable .

5 Results and discussion

Hereafter, the current model of the hybrid nanofluid flow inside water solar collectors is analyzed by using the GTM method. Two different novel models are obtained at two different cases of the power-law index . In the first model, the flow will be Newtonian at , whereas in the second model, the flow will be non-Newtonian at . The influence of different parameters including , , , , , , and on the hybrid nanofluid characteristics is depicted graphically.

The applications of (Cu) and (Fe₃O₄) effective nanoparticles are demonstrated in solar thermal collectors, nanotechnology, and ferrofluids due to their physicochemical properties, such as high magnetic susceptibility and chemical stability (Jamshed and Aziz, 2018; Nezafat and Nasrollahzadeh, 2021; Nguyen et al., 2021). The properties of the (H₂O) base fluid and (Cu and Fe₃O₄) nanoparticles are shown in Table 2 (Jamshed and Aziz, 2018).

The accuracy of the used method is assessed as shown in Figure 2, which presents a comparison between our results and the results reported by Khan et al. (2015). Validation has been performed in a similar and limiting case as in Khan et al. (2015).These results have been achieved for the 3-D Newtonian flow under the influence of solar radiation, thermophoretic, and Brownian motion. As seen in Figure 2, the impact of the Prandtl number (Pr = 7) on the temperature profile is performed at and . Moreover, the comparative analysis of the Nusselt number is compared to the accepted published data by Abolbashar et al. (2014), Jamshed et al. (2021c), and Jamshed et al. (2022b) in Table 3.

FIGURE 2

Khan et al. (2015).

According to results in Figure 2 and Table 3, the current examination agrees with the published results.

Table 4 presents the quantitative values of skin friction, Nusselt number, and the Sherwood number.

5.1 Influence of Prandtl number

Figures 3A, B demonstrates the influence of the Prandtl number on the fluid’s characteristics within a range . According to the definition of the Prandtl number, larger values of lead to the increase in the fluid viscosity; as a result of this, the horizontal velocity diminishes, as shown in Figure 3A. The Prandtl number exhibits an inverse relationship with thermal diffusivity, resulting in a decrease in the temperature field, as shown in Figure 3B.

FIGURE 3

5.2 Effect of the magnetic field, M

The variation in fluid characteristics against the magnetic parameter is examined in Figures 4A, B. The application of a magnetic field to a fluid results in the generation of a resistive force known as the Lorentz force, which acts to impede the motion of the fluid. Hence, the reduction in the horizontal velocity is observed when the magnetic parameter M increases, as shown in Figure 4A. Based on the definition of the magnetic parameter, raising the magnetic field reduces the density. Consequently, the temperature field slightly increases, as shown in Figure 4B.

FIGURE 4

5.3 Effect of the power-law index, n

The performance of on the velocity and temperature distribution is explained in Figures 5A, B. As the parameter increases, the horizontal velocity is raised to a higher value. Based on the findings shown in Figure 5B, there is a negative correlation between the power, n, and the temperature, indicating that an increase in power, n, leads to a drop in the temperature.

FIGURE 5

5.4 Effect of the inclination angle, Γ

The influence of the plate inclination from to , on the fluid characteristics, is shown in Figures 6A–C. Moving away from the horizontal axis reduces the velocity because of the decrease in the gravity effect. The observations indicated a decrement in the velocity due to the increment in as presented in Figure 6A. A reverse phenomenon is shown in Figures 6B, C; the temperature and concentration of nanoparticles increase for a large value of the inclination angle. The inclination affects the value of the net magnetic flux, which, in turn, is the reason for the previous results.

FIGURE 6

5.5 Effect of the radiation parameter, R_d

The thermal boundary layer thickness increases as the temperature of the hybrid nanofluid increases. Increasing acquires the system a large amount of heat, subsequently raising the hybrid nanofluid temperature. The temperature demonstrates a positive correlation with the radiation parameter , as illustrated in Figure 7A. The inverse relationship is evident in the case of the heat flux and concentration, as illustrated in Figures 7B, C.

FIGURE 7

5.6 Effect of Brownian motion and the thermophoresis parameter, N_t

Figures 8, 9 are plotted to examine the effects in the fluid characteristics for a range of Brownian motion and the thermophoresis parameter . Moreover, it is illustrated that the Brownian force rises for a larger value. This leads to a decrease in the concentration if increased, as illustrated in Figure 8. When the thermophoresis force rises, the concentration climbs to a peak value far away from the plate surface and then decreases to zero, establishing the boundary condition shown in Figure 9.

FIGURE 8

FIGURE 9

5.7 Effect of the nanoparticle ratio, γ_φ

The hybrid nanofluid contains the blend of two nanoparticles (NPs), including iron oxide and copper (Cu). The ratio of the volume fraction of magnetite particles to copper is defined as the nanoparticle ratio . An increase in the values of leads to the enhancement in the temperature field due to an increase in thermal conductance, as shown in Figure 10. Notably, when it means that only the nanoparticles of copper are used and the fluid is a mono-nanofluid. As the value of increases, this means that a hybrid mix of nanoparticles is used with different percentages. The resultant is an improvement in the thermal characteristics.

FIGURE 10

5.8 Effect of the studied parameters on the entropy output, N_G

Entropy generation is influenced by M, which is illustrated through Figure 11A. The large values of M generate more Lorentz force, which retards the fluid motion and decreases entropy generation. Physically, for the large values of the diffusive variable L, the mass diffusivity rises and leads to an increment in entropy generation, as seen in Figure 11B. The decrease in can be observed in Figure 11C as a result of the increase in the temperature ratio parameter , which is attributed to the presence of irreversible processes. The augmentation of is observed when the concentration ratio parameter is increased, which is attributed to the increase in mass transfer irreversibility, as shown in Figure 11D. The behavior of for various temperature differences is plotted in Figure 11E. The reduction of losses from heated components in a Solar System collector, with the purpose of improving the overall performance, is achieved by increasing the temperature differential . This increase in corresponds to a minimum value of due to the irreversible nature of the process.

FIGURE 11

6 Conclusion

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