Abstract
This study explores the flow irreversibility of the Ellis hybrid nanofluid (containing nanoparticles) with homogeneous and heterogeneous reactions to a horizontal porous stretching cylinder. The energy transportation aspects are investigated in terms of the influence of joule heating and viscous dissipation. The slip and convective boundary conditions are levied on the cylindrical surface, and the mathematical flow model is transferred to a system of nonlinear ordinary differential equations using suitable transformations. The highly nonlinear systems of equations are numerically solved using the bvp4c approach in MATLAB. The graphical outcomes are obtained and discussed; it is worth noting that incremental estimations of the curvature parameter show opposite behaviors on the Ellis fluid velocity and entropy generation, i.e., the entropy generation profile increases while fluid velocity decreases. The boundary layer thinning shows resistance to impact by elasticity and magnetic field. Further, as the porosity of the liquid phase increases, the momentum of the boundary layer decreases.
Introduction
At present, the development of the human society depends mainly on energy transfer and energy sources. Improvements with regard to generation and utilization of energy can considerably affect the industrial and engineering fields. Advancements in energy transport mechanisms have been investigated, where the thermal capacitances of the base fluids (water, glycols, and engine oil) are boosted by mixing a nanofluid into them. Nanofluids are widely used for community service applications, such as solar cells, nuclear power plants, refrigerators, heat exchangers, and vehicles. Choi and Eastman [1] first proposed the idea of a nanofluid. Advanced and novel applications of nanofluids in domestic refrigerators, power engines, and chillers were then investigated [2]. The thermal and solutal energy transportation towards a stretching surface in a molybdenum disulfide nanoliquid was studied by Waqas et al. [3]. The heat and mass transport features of Cu- and Ag-water across a porous rotating disc affected by thermal radiation, partial slip, and chemical reactions were examined by Reddy et al. [4]. Krishna and Chamkha [5] surveyed the magnetohydrodynamic (MHD) free convective rotating flow of nanofluids (Ag and TiO2) influenced by the Hall current as well as generation or absorption on a semi-infinite permeable moving plate. The application of the boundary layer flow to nanoparticles along uniform heat flux and heat transport in electronic chips was analyzed by Waqas et al. [6]. Moreover, theoreticians have reported similar studies [6–18]. Hybrid nanofluids are used to enrich the heat transport rates and thermal conductivities of conventional fluids; such hybrid nanofluids are formed by a mixture of nanoparticles immersed in a base fluid to improve the heat transport capacities of the convectional fluids. Turcu et al. [19] and Jana et al. [20] established the idea of hybrid nanofluids that boost the thermal capacitances of regular nanofluids. Devi and Devi [21] presented improved heat transport by distribution of a water-based aluminum oxide () and copper hybrid nanofluid subjected to a stretchable surface. The heat and mass transportation aspects of the (alumina-copper/water) hybrid nanofluid toward the stretching cylinder was reported by Maskeen et al. [22]. The solutal and thermal transport features of the transient MHD hybrid nanofluid flow with thermal radiation, chemical reaction, and suction/injection across the extending surface reported by Sreedevi et al. [23]. Other substantial works regarding hybrid nanofluids have also been proposed [24–29].
Chemical reactions are typically categorized into two types as heterogeneous and homogeneous reactions. The processes of burning, fog formation and dispersion, and catalysis occur by such homogeneous and heterogeneous reactions. Homogeneous reactions occur at all phases, while heterogeneous reactions generally occur in confined patches. Chaudhary and Merkin [30] initially proposed the boundary layer flow along the heterogeneous–homogeneous reactions of an isothermal model. Ramzan et al. [31] investigated the electromagnetohydrodynamic hybrid nanofluid flow past two rotating disks along the homogeneous–heterogeneous reaction and its irreversibility analysis. Khan et al. [32] considered the cubic autocatalysis chemical reaction to investigate the flow of magnetized Oldroyd-B fluid across a stretching cylinder. Other investigators have also focused on the influences of the homogeneous–heterogeneous reactions in their recent works [33–38].
The energy losses during an irretrievable process are broadly called as entropy generation. The second law of thermodynamics is considered to measure the energy losses during such irretrievable procedures. Researchers have proposed various approaches to reduce energy losses. The operations of actual systems are unvaryingly related to work losses in accordance with the second law of thermodynamics [39]. Researchers who have investigated entropy generation [40, 41] have deeply analyzed the applications of entropy in several fields. The stagnation point flow of a hybrid nanofluid in the investigation of entropy generation across a stretching sheet was examined by Jakeer and Reddy [42]. Other studies on entropy generation may also be found in literature [43–47].
MHD considerations have many applications in engineering, such as electrical furnaces, nuclear reactors, installation of nuclear accelerators, turbo machinery, and blood flow, and many researchers have investigated their impacts. Ahmad et al. [48] demonstrated the 3D MHD Maxwell nanofluid flow towards a slendering stretching surface affected by joule heating, heat generation, and thermal radiation. Takhar et al. [49] investigated the time-dependent laminar boundary layer flow of an electrically conducting fluid along an aligned magnetic field toward a semi-infinite flat plate. Saeed et al. [50] considered the six-constant Jeffreys nanofluid in an asymmetric channel with inclined magnetic fields to examine the theoretical impact of slip barriers on double diffusion subject to peristaltic flow. The ion and Hall slip impacts on an unstable laminar MHD convective rotating flow of a second-grade fluid across a semi-infinite vertical moving permeable sheet were theoretically investigated by Krishna et al. [51]. Several other researchers [52–59] have also discussed the importance of MHD flows along various geometries.
The main purpose of this work is to explore the 2D boundary layer flow of the Ellis nanofluid (containing nanoparticles) toward the horizontal porous stretching cylinder under convective and slip boundary conditions. The thermal and solutal transport aspects are investigated with respect to the impacts of viscous dissipation, joule heating, and homogeneous–heterogeneous reactions. The novelty and main contribution of this work involve examining the axisymmetric MHD Ellis hybrid nanofluid flow along homogeneous–heterogeneous reactions and entropy generation effect, which have not been considered in literature thus far. The basic equations developed here are represented as a system of ordinary differential equations (ODEs) using similarity variables. These ODEs are numerically solved using the bvp4c approach in MATLAB. The graphical conclusions are evaluated in terms of velocity, temperature, and homogeneous–heterogeneous (homo–hetero) profiles. Moreover, comparison of the current outcomes with previously reported numerical data shows good agreement.
Mathematical modeling
In the mathematical model, we consider a steady 2D laminar incompressible axisymmetric MHD Ellis hybrid nanofluid flow with nanoparticles across a horizontal porous stretching cylinder. The homogeneous and heterogeneous chemical species are examined to assess the solutal energy transport. The thermal energy transport aspects are discussed under viscous dissipation and joule heating. Figure 1 illustrates that the axis is chosen as the cylindrical coordinate system and that the axis is perpendicular to the cylindrical surface. Here, we consider the fluid velocity as , where and is the length. is the magnetic field that is normal to the cylindrical surface. Additionally, the cylinder temperature is and ambient temperature is .
FIGURE 1
Flow diagram of the problem.
The equation of the homo–hetero reaction process is stated as follows [30, 31]:The first-order isothermal single reaction is stated asHere, and are the substance species with concentrations and , respectively. Moreover, and are the constant rates.
Using the above assumption and applying the boundary layer theory, the mathematical flow model is defined as [10, 31]The appropriate conditions at the boundary are as follows [37]:In Eqs. 3–9, the components of the velocity are and in the directions and , respectively. The symbols , , , , , , , , , , and represent the hybrid nanofluid density, dynamic viscosity, electrical conductivity, magnetic field intensity, material constant, thermal diffusivity, specific heat, diffusion coefficient, factor of velocity slip, constant rate, and factor of thermal slip, respectively. The thermophysical characteristics of the hybrid nanofluid with a convectional fluid are listed in Table 1.
Hybrid nanofluid model
The hybrid nanofluid correlation properties of dynamic viscosity, thermal conductivity, heat capacity, density, and electrical conductivity are defined experimentally.
Similarity variables
The applicable similarity variables are as follows [10]:Using the similarity variables in Eq. 10 and Table 2, Eqs. 4–9 can be rewritten as follows:The dimensionless forms of the boundary conditions are given as
TABLE 2
| Characteristics | Relationships |
|---|---|
| Dynamic viscosity | |
| Density | |
| Thermal conductivity | |
| Heat capacity | |
| Electrical conductivity |
Note that, and denote CoFe2O4 and TiO2 nanoparticles, respectively, where . The value of the solid volume fraction is taken as 0.02 (2%).
Assuming that the particles of the substances of both species have the same coefficients of diffusion and , i.e., the ratio of the diffusion parameters ; thus, we haveEqs. 16, 17 are combined to getThe conditions at the boundary are then given as
The governing parameters here are those of the magnetic field , suction , thermal slip , velocity slip , heterogeneous reaction , porosity , Schmidt number , Eckert number , material , curvature , and Prandtl number .
Entropy generation
Entropy generation is defined in terms of the magnetic field, joule heating, and viscous dissipation. The equation of entropy generation is as follows:The entropy generation is the ratio of the entropy generation rate to the properties of the entropy generation rate , such thatwhere is the temperature ratio parameter and is the Brinkman number. Moreover, and are defined as and .
Result and discussion
The numerical solution to the above problem is obtained using bvp4c in MATLAB. Table 3 shows a comparison of the velocity gradient with the results of Ramesh et al. [37] and Bhattacharyya et al. [57] in the absence of , ,, and by taking . The results of this study are in good agreement with the previously published results. The influences of distinct parameters, such as the curvature, magnetic, porosity, thermal slip, suction, surface-catalyzed, homogeneous reaction, and temperature ratio parameters, as well as the Brinkman number on the velocity, temperature, homo–hetero reaction, and entropy generation profile are discussed in Figures 2–7.
TABLE 3
| <!—Col Count:4γ | Ramesh et al. [37] | Bhattacharyya et al. [57] | Present results |
|---|---|---|---|
| 0.1 | 2.100332 | 2.1003187 | 2.10034 |
| 0.2 | 2.058843 | 2.0588875 | 2.05886 |
| 0.3 | 2.008887 | 2.0088406 | 2.00885 |
Justification of results in the absence of , , , and , with .
FIGURE 2
(A–D) Outcomes of , , , and against .
FIGURE 3
(A,B) Outcomes of and against .
FIGURE 4
(A,B) Outcomes of against and .
FIGURE 5
(A,B) Outcomes of and against and , respectively.
FIGURE 6
(A,B) Outcomes of against and .
FIGURE 7
(A,B) Outcomes of against and .
Figures 2A–D show the impacts of the curvature parameter on the velocity, temperature, homo–hetero reaction, and entropy generation profile. From Figure 2A, it is observed that the fluid velocity profile displays a dual trend with increase in the curvature parameter; for a higher value of the curvature parameter, the fluid velocity near the surface increases, while diminishing away from the boundary. The radius and curvature of the cylinder are inversely proportional; therefore, the radius of the cylinder reduces as the curvature parameter increases. As a result, the contact of the Ellis fluid along the cylinder surface decreases, and the surface supports a small resistance owing to the Ellis fluid particles; further, increasing values of decrease the Ellis velocity of the fluid. Figure 2B shows how the fluid temperature increases when the curvature parameter increases. Physically, increasing values of (curvature parameter) reflect the increasing thermal boundary layer thickness, which result in increased heat transmission and fluid temperature. Similarly, the curvature parameter improves the concentration and entropy generation distribution, as shown in Figures 2C,D. The impacts of the magnetic parameter on the fluid velocity and temperature are shown in Figures 3A,B. It is noted that the fluid velocity increases as the corresponding thickness of the boundary layer decreases; this is attributed to the fact that the increment in the magnetic field parameter produces a Lorentz force, which enhances the resistance of fluid flow. Consequently, the fluid velocity of the Ellis hybrid fluid diminishes. From Figure 3B, it is obvious that the fluid temperature condenses by stronger estimation of the magnetic parameter. Figures 4A,B show the effects of the material constant and porosity parameter on fluid velocity. The influence of the material constant is observed in Figure 4A, where the velocity reduces and the related thickness of the boundary increases with improvement in the value of the material parameter. The impact of on the velocity distribution of the Ellis hybrid nanofluid is shown in Figure 4B. As the porosity of the liquid phase increases, the momentum boundary layer decreases. Additionally, as we move farther from the bounded surface, the fluid velocity is unaffected by the porosity of the boundary. The effects of the suction and thermal slip parameters on velocity and temperature are respectively shown in Figures 5A,B. Figure 5A presents the velocity characteristics to obtain a better estimate of the suction parameter. The thickness of the momentum boundary layer appears to decrease as a result of this; the drag force develops while the suction parameter increases, which causes the thickness of the momentum boundary layer to reduce. As the thermal and velocity slip parameters increase, the wall temperature decreases, as shown in Figures 5A,B. The velocity slip parameter partially reflects the increment of the conversion of the dragging force on the stretching wall toward the liquid; as the thermal slip parameter increases, it produces a decaying trend in the thermal layer thickness, indicating that even small amounts of heat are transferred to the liquid that has leaked from the surface. Figure 6A shows the properties of the homogeneous reaction parameter’s strength on the plot. The trend of the plot diminishes with increment of the homogeneous reaction parameter. The performance of for the surface-catalyzed reaction is depicted in Figure 6B. The reactants gain a greater surface area for the reaction to proceed through the use of porous media. The reaction rate is additionally accelerated by the surface-catalyzed reaction; hence, increasing the surface-catalyzed reaction lowers more quickly. In Figures 7A,B, the outcomes of the temperature ratio parameter and Brinkman number on entropy generation are shown; it can be observed from the figures that the entropy generation distribution is boosted by increments to the temperature ratio parameter and Brinkman number.
Concluding remarks
The
Ellis hybrid nanofluid flow was explored in a permeable horizontal cylinder through the combined impacts of joule heating, homogeneous–heterogeneous reactions, and slip boundary conditions. The highly nonlinear ODEs were numerically solved using bvp4c in MATLAB. The following are the conclusions of this study:
➢ The curvature parameter shows dual behaviors for fluid velocity and entropy generation as the temperature and nanoparticle concentration of the fluid increase.
➢ The momentum boundary layer thickness reduces with stronger estimations of the magnetic and porosity parameters.
➢ The fluid velocity improves with the suction parameter but diminishes for stronger estimation of the material parameter.
➢ The fluid concentration decreases as the surface-catalyzed and homogeneous reaction parameters increase.
➢ The entropy generation profile is improved by the temperature ratio parameter and Brinkman number.
➢ The thermal and velocity slip parameters reduce the temperature distribution.
Finally, we note that our work was built on the Ellis model for fluid rheology using the unique behaviors of the straightforward power-law model. In particular, as the flow rate in the basic state is zero, the power-law model predicts either a zero or an infinite critical estimate for the Darcy–Rayleigh number, as stated in Barletta and Nield [60]. However, the application of the Ellis model results in a nonsingular trend as the basic flow rate approaches zero, reaching the same critical estimate of the Darcy–Rayleigh number in the case of a Newtonian fluid.
Statements
Data availability statement
The original contributions presented in the study are included in the article/Supplementary Material, and further inquiries can be directed to the corresponding author.
Author contributions
MK: Writing-Original Draft Preparation, Data Curation, Investigation, Visualization, Validation. NA: Help in computation. SA: Conceptualization, Methodology, Software, Formal Analysis, Writing-Original Draft Preparation. ME; Review the modeling of the problem. ET-e; Improve the physical discussion. KG: Performs the critical review. KAG; Help in coding. MY; Help in problem formulation.
Acknowledgments
The authors extend their appreciation to the Deanship of Scientific Research at King Khalid University, Abha, Saudi Arabia, for funding this work through the Research Group Program under grant no. RGP. 2/19/43. The authors would like to thank the Deanship of Scientific Research at Umm Al-Qura University for supporting this work by Grant Code: (22UQU4331317DSR68). The authors thank to Taif University Researcher for Supporting project number (TURSP-2020/16), Taif University, Taif, Saudi Arabia.
Conflict of interest
The 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.
Nomenclature
Axis coordinates
Heat capacity
Electrical conductivity
Material constants
Magnetic field intensity
Ambient temperature
Variable diffusion coefficients of chemical species and
Chemical species
Reaction rates
Thermal conductivity
Interfacial surface area
Arbitrary constants
Magnetic parameter
Curvature parameter
Volume fraction of nanoparticles ()
Titanium oxide
Hybrid nanoparticle volume fraction
Brinkman number
Eckert number
Suction parameter
Thermal slip parameter
Entropy generation
Temperature ratio parameter
Velocity components
Permeability of porous medium
Free stream and wall velocities
Wall temperature
Hybrid nanofluid density
Hybrid nanofluid thermal diffusivity
Kinematic viscosity of hybrid nanofluid
Concentration of
Concentration of
Similarity variable
Prandtl number
Surface-catalyzed parameter
Material parameter
Porosity parameter
Volume fraction of nanoparticles ()
Cobalt ferrite
Schmidt number
Parameter of homogeneous reaction
Parameter of heterogeneous reaction
Velocity slip parameter
Ratio of the diffusion coefficient
Dynamic viscosity
Characteristic entropy generation rate
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Summary
Keywords
Ellis hybrid nanofluid, joule (ohmic) heating, viscous dissipation, surface-catalyzed reaction, homogeneous–heterogeneous reaction
Citation
Khan MN, Ahammad NA, Ahmad S, Elkotb MA, Tag-eldin E, Guedri K, Gepreel KA and Yassen MF (2022) Thermophysical features of Ellis hybrid nanofluid flow with surface-catalyzed reaction and irreversibility analysis subjected to porous cylindrical surface. Front. Phys. 10:986501. doi: 10.3389/fphy.2022.986501
Received
05 July 2022
Accepted
02 August 2022
Published
15 September 2022
Volume
10 - 2022
Edited by
Arshad Riaz, University of Education Lahore, Pakistan
Reviewed by
Hassan Waqas, Government College University, Faisalabad, Pakistan
Ali Chamkha, Kuwait College of Science and Technology, Kuwait
Hina Sadaf, National University of Sciences and Technology (NUST), Pakistan
Safia Akram, National University of Sciences and Technology (NUST), Pakistan
Updates
Copyright
© 2022 Khan, Ahammad, Ahmad, Elkotb, Tag-eldin, Guedri, Gepreel and Yassen.
This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Shafiq Ahmad, ashafiq@math.qau.edu.pk
This article was submitted to Interdisciplinary Physics, a section of the journal Frontiers in Physics
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