The effects of heat generation/absorption and thermal radiation on MHD natural convective flow inside the I-shaped cavity saturated with ferrofluid have been investigated in this study. The Cobalt-kerosene type of ferrofluid has been used with solid volume fractions (Φ = 0∼0.06). The penalty finite element technique with Galerkin weighted method has been used to attain the solution of highly non-linear governing PDE’s. Simulations are carried out in terms of stream lines, heat-lines, isotherms contours and local Nusselt number for wide range of physical flow parameters including thermal radiation (NR = 0∼10), heat generation/absorption (ξ = −5∼5), Hartmann (Ha = 0∼10), Rayleigh (Ra = 103∼106), Prandtl (Pr = 6.83), Eckert (Ec = 10−5) and Magnetic number (Mn = 5 * 102). The obtained results show that increasing the concentration of solid volume friction (Φ) from 0 (pure base fluid) to 0.06 has improved heat transfer by 28% and velocity profiles by 23%. Increasing the Rayleigh number from 103 to 106 has significantly improved the total heat transfer rate along the bottom wall from 1.12 to 8.842. It is also noted that the intensity of circulation cells of streamlines and headlines has decreased with increasing Hartmann number (Ha).
{"title":"Augmenting the Energy Transport Through Magnetic Ferrofluid Filled Inside the I-Shaped Cavity Under the Influence of Thermal Radiation","authors":"M. Siddiqui, T. Javed, B. Iftikhar","doi":"10.1166/jon.2023.1952","DOIUrl":"https://doi.org/10.1166/jon.2023.1952","url":null,"abstract":"The effects of heat generation/absorption and thermal radiation on MHD natural convective flow inside the I-shaped cavity saturated with ferrofluid have been investigated in this study. The Cobalt-kerosene type of ferrofluid has been used with solid volume fractions (Φ =\u0000 0∼0.06). The penalty finite element technique with Galerkin weighted method has been used to attain the solution of highly non-linear governing PDE’s. Simulations are carried out in terms of stream lines, heat-lines, isotherms contours and local Nusselt number for wide range of physical\u0000 flow parameters including thermal radiation (NR = 0∼10), heat generation/absorption (ξ = −5∼5), Hartmann (Ha = 0∼10), Rayleigh (Ra = 103∼106), Prandtl (Pr = 6.83), Eckert (Ec = 10−5)\u0000 and Magnetic number (Mn = 5 * 102). The obtained results show that increasing the concentration of solid volume friction (Φ) from 0 (pure base fluid) to 0.06 has improved heat transfer by 28% and velocity profiles by 23%. Increasing the Rayleigh number from 103\u0000 to 106 has significantly improved the total heat transfer rate along the bottom wall from 1.12 to 8.842. It is also noted that the intensity of circulation cells of streamlines and headlines has decreased with increasing Hartmann number (Ha).","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45947704","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper investigates the heat and mass transfer of an unsteady, MHD incompressible water-based nanofluid (Cu and TiO2) flow over a stretching sheet in a transverse magnetic field with thermal radiation Soret effects. The governing differential equations are transformed into a set of non-linear ordinary differential equations and solved using a regular perturbation technique with appropriate boundary conditions for various physical parameters. The effects of different physical parameters on the dimensionless velocity, temperature, and concentration profiles are depicted graphically and analyzed in detail. Favourable comparisons with previously published work on various exceptional cases of the problem are obtained. Finally, numerical values of the physical quantities, such as the local skin-friction coefficient, the local Nusselt number and the local Sherwood number, are presented in tabular form. Results describe that the velocity and temperature diminish with enhancing the thermal radiation. Concentration decreases with improving the chemical reaction. Both velocity and concentration are enhanced with increases of soret parameter. And also, water–based TiO2 nanofluids possess higher velocity than water-based Cu nanofluids.
{"title":"Study of Heat and Mass Transfer of an Unsteady Magnetohydrodynamic (MHD) Nanofluid Flow Past a Vertical Porous Plate in the Presence of Chemical Reaction, Radiation and Soret Effects","authors":"K. Raghunath","doi":"10.1166/jon.2023.1965","DOIUrl":"https://doi.org/10.1166/jon.2023.1965","url":null,"abstract":"This paper investigates the heat and mass transfer of an unsteady, MHD incompressible water-based nanofluid (Cu and TiO2) flow over a stretching sheet in a transverse magnetic field with thermal radiation Soret effects. The governing differential equations are transformed\u0000 into a set of non-linear ordinary differential equations and solved using a regular perturbation technique with appropriate boundary conditions for various physical parameters. The effects of different physical parameters on the dimensionless velocity, temperature, and concentration profiles\u0000 are depicted graphically and analyzed in detail. Favourable comparisons with previously published work on various exceptional cases of the problem are obtained. Finally, numerical values of the physical quantities, such as the local skin-friction coefficient, the local Nusselt number and the\u0000 local Sherwood number, are presented in tabular form. Results describe that the velocity and temperature diminish with enhancing the thermal radiation. Concentration decreases with improving the chemical reaction. Both velocity and concentration are enhanced with increases of soret parameter.\u0000 And also, water–based TiO2 nanofluids possess higher velocity than water-based Cu nanofluids.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46145692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Vapour compression refrigeration systems (VCRS) are commonly used in the tropic region for the cooling and preservation of household and industrial items. The performance, power consumption and exergy efficiency of the vapour compression refrigeration system (VCRS) can be improved by replacing the lubricant with nanolubricants. In this study, nanolubricants were prepared at different mass concentrations of 1%, 3%, 5%, 10%, and 20% using aluminium oxide (Al2O3) nanoparticles of nominal diameter 10 nm, 20–30 nm and 80 nm. Scanning electron microscopy (SEM) and X-ray diffraction analyses were carried out on the aluminium oxide (Al2O3) nanoparticles. Using R600a and R134a refrigerants to investigate heat transfer behaviour of nanorefrigerant, the addition of nanoparticles into the VCRS enhanced the performance and exergy efficiency of the system. This was achieved by reducing the energy consumed and destroyed within the compressor of VCRS. Smaller nominal diameter nanoparticles of 10 nm performed better and possess better exergy efficiency for nanoR600a while the 20–30 nm had the best performance for nanoR134a refrigerant. The average value of coefficient of performance (COP) obtained was observed to be higher for R600a using 10 nm sized nanoparticles compared with R134a.
{"title":"Influence of Refrigerant Type, Nanoparticle’s Concentration and Size on the Performance and Exergy Efficiency of the Vapour Compression Refrigeration System Using Al2O3 Based Nanolubricant","authors":"M. Ogbonnaya, O. Ajayi, M. A. Waheed","doi":"10.1166/jon.2023.1953","DOIUrl":"https://doi.org/10.1166/jon.2023.1953","url":null,"abstract":"Vapour compression refrigeration systems (VCRS) are commonly used in the tropic region for the cooling and preservation of household and industrial items. The performance, power consumption and exergy efficiency of the vapour compression refrigeration system (VCRS) can be improved by\u0000 replacing the lubricant with nanolubricants. In this study, nanolubricants were prepared at different mass concentrations of 1%, 3%, 5%, 10%, and 20% using aluminium oxide (Al2O3) nanoparticles of nominal diameter 10 nm, 20–30 nm and 80 nm. Scanning electron microscopy\u0000 (SEM) and X-ray diffraction analyses were carried out on the aluminium oxide (Al2O3) nanoparticles. Using R600a and R134a refrigerants to investigate heat transfer behaviour of nanorefrigerant, the addition of nanoparticles into the VCRS enhanced the performance and exergy\u0000 efficiency of the system. This was achieved by reducing the energy consumed and destroyed within the compressor of VCRS. Smaller nominal diameter nanoparticles of 10 nm performed better and possess better exergy efficiency for nanoR600a while the 20–30 nm had the best performance for\u0000 nanoR134a refrigerant. The average value of coefficient of performance (COP) obtained was observed to be higher for R600a using 10 nm sized nanoparticles compared with R134a.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48076094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, the focal aims are (i) to explore the transient boundary-layer flow and heat transfer of an electrically conducting hybrid (Ag–CuO water) nanofluid along a vertical stretching surface (sheet) having non-zero slot velocity at variable temperature, and (ii) to discuss the influences of momentous parameters involved on the heat transfer and skin friction coefficient graphically. The “Tiwari-Das nanofluid model” is used. The central equations (PDEs) are converted into finite difference equations by the powerful Crank Nicolson technique and numerically solved using the Thomas algorithm. The achieved outcomes for a specific case of the challenge are compared with an analytical solution computed using the Laplace transform technique and discovered to be in excellent accord.
{"title":"Unsteady Hybrid (Ag–CuO/Water) Nanofluid Flow and Heat Transfer due to a Stretching Sheet with Variable Temperature","authors":"V. Rajesh, M. Srilatha, Ali J. Chamkha","doi":"10.1166/jon.2023.2004","DOIUrl":"https://doi.org/10.1166/jon.2023.2004","url":null,"abstract":"In this paper, the focal aims are (i) to explore the transient boundary-layer flow and heat transfer of an electrically conducting hybrid (Ag–CuO water) nanofluid along a vertical stretching surface (sheet) having non-zero slot velocity at variable temperature, and (ii) to discuss\u0000 the influences of momentous parameters involved on the heat transfer and skin friction coefficient graphically. The “Tiwari-Das nanofluid model” is used. The central equations (PDEs) are converted into finite difference equations by the powerful Crank Nicolson technique and numerically\u0000 solved using the Thomas algorithm. The achieved outcomes for a specific case of the challenge are compared with an analytical solution computed using the Laplace transform technique and discovered to be in excellent accord.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47178142","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This research presents mathematically developed model to examine non-Newtonian Casson fluid flow in the existence of radiation, Ohmic dissipation, thermo-diffusion and diffusion-thermo over infinite vertical plate domain. Using similarity transformations, the governing partial derivative related to fluid model is transmuted to ordinary derivative equations and then solved computationally by adopting Runge-Kutta method via shooting quadrature in mathematical software MAPLE. The impacts of various considered effects were assed and solutions for momentum velocity profiles, heat transfer energy and mass transfer concentration profiles are investigated via graphical presentation. The outcomes show that radiation and magnetic field increased heat distribution and improvement in yield stress through an enhancement in Casson term reduces the flow speed. Presence of Cross diffusion terms has remarkable impact on thermal and solutal profiles. Further, numerical significances of engineering quantities such as skin friction, Nusselt number and Sherwood number are provided in tabular form. Finally, to justify the outcomes of this study, a resemblance is taken with earlier published works and found there is good correlation.
{"title":"Numerical Solution of Radiative and Dissipative Flow on Non-Newtonian Casson Fluid Model via Infinite Vertical Plate with Thermo-Diffusion and Diffusion-Thermo Effects","authors":"M. Sunder Ram, N. Ashok, M. Shamshuddin","doi":"10.1166/jon.2023.1976","DOIUrl":"https://doi.org/10.1166/jon.2023.1976","url":null,"abstract":"This research presents mathematically developed model to examine non-Newtonian Casson fluid flow in the existence of radiation, Ohmic dissipation, thermo-diffusion and diffusion-thermo over infinite vertical plate domain. Using similarity transformations, the governing partial derivative\u0000 related to fluid model is transmuted to ordinary derivative equations and then solved computationally by adopting Runge-Kutta method via shooting quadrature in mathematical software MAPLE. The impacts of various considered effects were assed and solutions for momentum velocity profiles, heat\u0000 transfer energy and mass transfer concentration profiles are investigated via graphical presentation. The outcomes show that radiation and magnetic field increased heat distribution and improvement in yield stress through an enhancement in Casson term reduces the flow speed. Presence of Cross\u0000 diffusion terms has remarkable impact on thermal and solutal profiles. Further, numerical significances of engineering quantities such as skin friction, Nusselt number and Sherwood number are provided in tabular form. Finally, to justify the outcomes of this study, a resemblance is taken with\u0000 earlier published works and found there is good correlation.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48860017","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
For the last few years, thermal instability of non-Newtonian nanofluids becomes a prominent field of research because it has various applications in automotive industries, energy-saving, nuclear reactors, transportation, electronics etc. and suspensions of nanoparticles are being developed in medical applications including cancer therapy. In this paper, a free electrothermo-convective instability in a dielectric nanofluid layer in a porous medium is studied. An Oldroyd’s constitutive equation is used to describe the behaviour of nanofluid and for porous medium, the Darcy model is employed. The equation of conservation of momentum of fluid is stimulated due to the presence of an AC electric field, stress-relaxation parameter and strain-retardation parameter. The stability of the system is discussed in stationary and oscillatory convections for free–free boundaries. For the case stationary convection, it is found that the Oldroydian Nanofluid behaves like an ordinary nanofluid as the stationary Rayleigh number is independent of the stress-relaxation parameter, the strain-retardation parameter and Vadasz number. The effect of stress-relaxation-time parameter, strain-retardation-time parameter, Vadasz number, nanoparticles Rayleigh number, modified diffusivity ratio, medium porosity, Lewis number and electric Rayleigh number examined numerically and graphs have been plotted to analyse the stability of the system. It is observed that the electrical Rayleigh number has destabilizing influence whereas nanoparticles Rayleigh number, porosity and modified diffusivity ratio have stabilizing effect on the system. The oscillatory convection is possible for the values of the stress-relaxation parameter less than the strain-retardation parameter for both top-heavy/bottom-heavy distributions of nanoparticles.
{"title":"Free Electrothermo-Convective Instability in a Dielectric Oldroydian Nanofluid Layer in a Porous Medium","authors":"Poonam Kumari Gautam, G. C. Rana, Hemlata Saxena","doi":"10.1166/jon.2023.1943","DOIUrl":"https://doi.org/10.1166/jon.2023.1943","url":null,"abstract":"For the last few years, thermal instability of non-Newtonian nanofluids becomes a prominent field of research because it has various applications in automotive industries, energy-saving, nuclear reactors, transportation, electronics etc. and suspensions of nanoparticles are being developed\u0000 in medical applications including cancer therapy. In this paper, a free electrothermo-convective instability in a dielectric nanofluid layer in a porous medium is studied. An Oldroyd’s constitutive equation is used to describe the behaviour of nanofluid and for porous medium, the Darcy\u0000 model is employed. The equation of conservation of momentum of fluid is stimulated due to the presence of an AC electric field, stress-relaxation parameter and strain-retardation parameter. The stability of the system is discussed in stationary and oscillatory convections for free–free\u0000 boundaries. For the case stationary convection, it is found that the Oldroydian Nanofluid behaves like an ordinary nanofluid as the stationary Rayleigh number is independent of the stress-relaxation parameter, the strain-retardation parameter and Vadasz number. The effect of stress-relaxation-time\u0000 parameter, strain-retardation-time parameter, Vadasz number, nanoparticles Rayleigh number, modified diffusivity ratio, medium porosity, Lewis number and electric Rayleigh number examined numerically and graphs have been plotted to analyse the stability of the system. It is observed that the\u0000 electrical Rayleigh number has destabilizing influence whereas nanoparticles Rayleigh number, porosity and modified diffusivity ratio have stabilizing effect on the system. The oscillatory convection is possible for the values of the stress-relaxation parameter less than the strain-retardation\u0000 parameter for both top-heavy/bottom-heavy distributions of nanoparticles.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47709592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper we investigate the effect of internal heat modulation over a nanofluid saturated porous medium. We consider a small variation in time dependant heat source and vary sinusoidally with slow time. An energy equation will be altered by adding time dependant internal heat source. This internal heat source has its time dependent and independent parts. Time dependent part shows that the internal heat modulation over a porous media and defines controls on heat/mass transfer in the layer. We have performed a nonlinear stability analysis to investigate heat/mass transfer in the system. The nonlinear system of partial differential equations are transformed into nonlinear ordinary differential equations under similarity transforms up to the second term. This system has different system parameters and they have been investigated on heat and mass transfer graphically. The dual nature, stabilize or destabilize is due to the significant effect of internal heating modulation of the system. Further, the effect of internal heating is to destabilize the system, as a consequence heat/mass transfer enhances. It is found that internal heating modulation can be used effectively to regulate heat/mass transfer in the system.
{"title":"Internal Heat Modulation on Darcy Convection in a Porous Media Saturated by Nanofluid","authors":"P. Kiran, S. H. Manjula","doi":"10.1166/jon.2023.1959","DOIUrl":"https://doi.org/10.1166/jon.2023.1959","url":null,"abstract":"In this paper we investigate the effect of internal heat modulation over a nanofluid saturated porous medium. We consider a small variation in time dependant heat source and vary sinusoidally with slow time. An energy equation will be altered by adding time dependant internal heat source.\u0000 This internal heat source has its time dependent and independent parts. Time dependent part shows that the internal heat modulation over a porous media and defines controls on heat/mass transfer in the layer. We have performed a nonlinear stability analysis to investigate heat/mass transfer\u0000 in the system. The nonlinear system of partial differential equations are transformed into nonlinear ordinary differential equations under similarity transforms up to the second term. This system has different system parameters and they have been investigated on heat and mass transfer graphically.\u0000 The dual nature, stabilize or destabilize is due to the significant effect of internal heating modulation of the system. Further, the effect of internal heating is to destabilize the system, as a consequence heat/mass transfer enhances. It is found that internal heating modulation can be used\u0000 effectively to regulate heat/mass transfer in the system.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49290603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current paper is on the boundary layer flow of a magnetohydrodynamic nanofluids (Cu, Al2O3 nanoparticles with base fluid water) flow over a linearly stretching cylinder. We have analyzed the entropy generation with heat and mass transfer in mixed convection, thermal radiation, viscous dissipation, variable thermal conductivity, variable mass diffusivity, and binary chemical reaction with activation energy. Convective boundary conditions are also considered here. No such attempt is yet made by the researchers on hybridization and entropy optimization model by considering variable thermal conductivity and variable mass diffusivity with binary chemical reaction with convective boundary conditions induced by a stretching cylinder. The efficient implicit Runge-Kutta-Fehlberg method with shooting technique is used for numerical solutions to the transformed-converted non-linear system of equations. The study is motivated by analyzing the effects on the nanofluid velocity, skin friction coefficient, temperature distribution, Nusselt number, nanoparticles concentration, and Sherwood number inside the boundary layer. The impact of solid volume fraction, chemical reaction, and activation energy with entropy generation is the key findings of the current investigation. Variable thermal conductivity and variable diffusivity parameters hike temperature and concentration profile, respectively. Entropy and Bejan number are increasing functions for curvature parameters.
{"title":"Entropy Analysis on Magneto-Convective and Chemically Reactive Nanofluids Flow Over a Stretching Cylinder in the Presence of Variable Thermal Conductivity and Variable Diffusivity","authors":"G. Mandal","doi":"10.1166/jon.2023.1977","DOIUrl":"https://doi.org/10.1166/jon.2023.1977","url":null,"abstract":"The current paper is on the boundary layer flow of a magnetohydrodynamic nanofluids (Cu, Al2O3 nanoparticles with base fluid water) flow over a linearly stretching cylinder. We have analyzed the entropy generation with heat and mass transfer in mixed convection,\u0000 thermal radiation, viscous dissipation, variable thermal conductivity, variable mass diffusivity, and binary chemical reaction with activation energy. Convective boundary conditions are also considered here. No such attempt is yet made by the researchers on hybridization and entropy optimization\u0000 model by considering variable thermal conductivity and variable mass diffusivity with binary chemical reaction with convective boundary conditions induced by a stretching cylinder. The efficient implicit Runge-Kutta-Fehlberg method with shooting technique is used for numerical solutions to\u0000 the transformed-converted non-linear system of equations. The study is motivated by analyzing the effects on the nanofluid velocity, skin friction coefficient, temperature distribution, Nusselt number, nanoparticles concentration, and Sherwood number inside the boundary layer. The impact of\u0000 solid volume fraction, chemical reaction, and activation energy with entropy generation is the key findings of the current investigation. Variable thermal conductivity and variable diffusivity parameters hike temperature and concentration profile, respectively. Entropy and Bejan number are\u0000 increasing functions for curvature parameters.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43254866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The main goal for this research is to investigate the effect of two composed hybrid nanoparticle materials in heat transfer with account several parameters and in two cases. In addition, exploring how the micropolar hybrid nanofluid (Cu–TiO2) behaves in a shrinking and expansion of the channel. The model considers external factors such as magnetic fields, heat radiation, and solar radiation. The boundary layer approach has been utilized to create transformations that pout the equations of the system in the dimensionless form. The shooting method has been combined with the fourth-order Runge-Kutta-Gill to numerically solve the modified ordinary differential equations. The impacts of the nanoparticles transport on the heat transfer and fluid flow are addressed, and the results are compared to the case of pure water. The velocity, isotherms, angular-velocity, and concentration distributions, are given in tables or graphs. It was found that the effect of heat on the hybrid nanofluids is directly proportional to its velocity and angular velocity. For mass fraction of the two nanofluids φ1 and φ2, the velocity profile f′(η) has a comparable influence for both hybrid nanofluid and nanofluid. The larger quantity of the factors φ1, φ2, M and Q enhance the temperature. For M, φ1 and φ2, the angular velocity profile g(η) has a comparable influence for both hybrid and magnetic parameter. The absorption parameter storing the radiation energy and augmentation of the solar irradiance immersion capacity leads to a greater heat transfer.
{"title":"Joule Heating and Viscous Dissipation Effects on a Stretching/Shrinking Cannel Filled by Micropolar Hybrid Nanofluid in Presence Thermal/Solar Radiation","authors":"H. A. El-dawy, M. El-Amin, Z. Raizah","doi":"10.1166/jon.2023.1957","DOIUrl":"https://doi.org/10.1166/jon.2023.1957","url":null,"abstract":"The main goal for this research is to investigate the effect of two composed hybrid nanoparticle materials in heat transfer with account several parameters and in two cases. In addition, exploring how the micropolar hybrid nanofluid (Cu–TiO2) behaves in a shrinking\u0000 and expansion of the channel. The model considers external factors such as magnetic fields, heat radiation, and solar radiation. The boundary layer approach has been utilized to create transformations that pout the equations of the system in the dimensionless form. The shooting method has\u0000 been combined with the fourth-order Runge-Kutta-Gill to numerically solve the modified ordinary differential equations. The impacts of the nanoparticles transport on the heat transfer and fluid flow are addressed, and the results are compared to the case of pure water. The velocity, isotherms,\u0000 angular-velocity, and concentration distributions, are given in tables or graphs. It was found that the effect of heat on the hybrid nanofluids is directly proportional to its velocity and angular velocity. For mass fraction of the two nanofluids φ1 and φ2,\u0000 the velocity profile f′(η) has a comparable influence for both hybrid nanofluid and nanofluid. The larger quantity of the factors φ1, φ2, M and Q enhance the temperature. For M, φ1 and\u0000 φ2, the angular velocity profile g(η) has a comparable influence for both hybrid and magnetic parameter. The absorption parameter storing the radiation energy and augmentation of the solar irradiance immersion capacity leads to a greater heat transfer.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48347560","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The current study explores the impact of entropy generation, thermal jump, radiation, and inclined magnetic field on the peristaltic transport of hyperbolic tangent fluid containing molybdenum disulfide and silver nanoparticles through an endoscope with a long wavelength and low Reynolds number assumptions. Between two coaxial tubes, a non-Newtonian hyperbolic tangent fluid with silver nanoparticles is considered. The Second law of thermodynamics is used to examine the entropy generation. The Homotopy perturbation method (HPM) is applied to describe the solution of nonlinear partial differential equations. We were able to arrive at analytical solutions for velocity, temperature, and nanoparticle concentration. In the end, the impact of various physical parameters on temperature, nanoparticle concentration, velocity, entropy generation, and Bejan number was graphically depicted. The significant outcome of the present study is that the impact of Hartmann number and Brownian motion parameter declines the velocity profile, but the thermal Grashoff number enhances velocity, whereas Platelet-shaped nanoparticles achieve a higher speed as compare to Spherical-shaped nanoparticles.
{"title":"Entropy Generation and Radiation Analysis on Peristaltic Transport of Hyperbolic Tangent Fluid with Hybrid Nanoparticle Through an Endoscope","authors":"S. Asha, Vijaylaxmi T. Talawar, M. M. Bhatti","doi":"10.1166/jon.2023.1993","DOIUrl":"https://doi.org/10.1166/jon.2023.1993","url":null,"abstract":"The current study explores the impact of entropy generation, thermal jump, radiation, and inclined magnetic field on the peristaltic transport of hyperbolic tangent fluid containing molybdenum disulfide and silver nanoparticles through an endoscope with a long wavelength and low Reynolds\u0000 number assumptions. Between two coaxial tubes, a non-Newtonian hyperbolic tangent fluid with silver nanoparticles is considered. The Second law of thermodynamics is used to examine the entropy generation. The Homotopy perturbation method (HPM) is applied to describe the solution of nonlinear\u0000 partial differential equations. We were able to arrive at analytical solutions for velocity, temperature, and nanoparticle concentration. In the end, the impact of various physical parameters on temperature, nanoparticle concentration, velocity, entropy generation, and Bejan number was graphically\u0000 depicted. The significant outcome of the present study is that the impact of Hartmann number and Brownian motion parameter declines the velocity profile, but the thermal Grashoff number enhances velocity, whereas Platelet-shaped nanoparticles achieve a higher speed as compare to Spherical-shaped\u0000 nanoparticles.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":" ","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46001135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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