K. V. Venugopal Reddy, M. Gnaneswara Reddy, G. Rami Reddy, O. Makinde
Nanofluids have analysis of wide applications of energy technologies in recent times as the thermal amplification of several manufacturing industries. A mathematical model is developed to stimulate electrokinetic transfer through peristaltic pumping of couple-stress micropolar nanofluids in a microchannel. The effects of Joule heating and chemical reaction have been considered. The remarkable properties of nanofluid are demonstrated by thermophoresis and Brownian motion characteristics. Thermophoresis has relevance in mass transport processes in many higher temperature gradient operating systems. The highly non-linear partial differential equations into ordinary differential equations by using appropriate similarities transformations. The graphical estimates are presented for the axial velocity, spin velocity, temperature of nano fluid, concentration and pumping characteristics. The outcomes of this study reveal the activation of Joule heating and chemical reaction effects in electroosmosis peristaltic transport of couple-stress, micropolar and nanofluids. This model is applicable to the study of chemical fraternization/separation procedures and bio microfluidics devices for the resolution of diagnosis.
{"title":"Analysis of Joule Heating and Chemical Reaction Effects in Electroosmosis Peristaltic Transport of Couple-Stress, Micropolar and Nanofluids","authors":"K. V. Venugopal Reddy, M. Gnaneswara Reddy, G. Rami Reddy, O. Makinde","doi":"10.1166/jon.2023.1963","DOIUrl":"https://doi.org/10.1166/jon.2023.1963","url":null,"abstract":"Nanofluids have analysis of wide applications of energy technologies in recent times as the thermal amplification of several manufacturing industries. A mathematical model is developed to stimulate electrokinetic transfer through peristaltic pumping of couple-stress micropolar nanofluids\u0000 in a microchannel. The effects of Joule heating and chemical reaction have been considered. The remarkable properties of nanofluid are demonstrated by thermophoresis and Brownian motion characteristics. Thermophoresis has relevance in mass transport processes in many higher temperature gradient\u0000 operating systems. The highly non-linear partial differential equations into ordinary differential equations by using appropriate similarities transformations. The graphical estimates are presented for the axial velocity, spin velocity, temperature of nano fluid, concentration and pumping\u0000 characteristics. The outcomes of this study reveal the activation of Joule heating and chemical reaction effects in electroosmosis peristaltic transport of couple-stress, micropolar and nanofluids. This model is applicable to the study of chemical fraternization/separation procedures and bio\u0000 microfluidics devices for the resolution of diagnosis.","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":"42298709","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}
Perhaps the most deliberated fluid problem in the field of Computational Fluid Dynamics is the lid driven cavity flow whose simple geometry is used to study the thermal behavior of many engineering applications such as cooling of electronic equipment, solar collectors, thermal storage systems, food processing, solar ponds, crystal growth, lubrication technologies and cooling of electrical and mechanical components. Researchers have been devoting much of their time in order to discover innovative methods to enhance the thermal conductivity of conventional fluids. With the development of nanotechnology, the concept of nanofluids has gained ground considerably as a new kind of heat transfer fluid. Nanofluid is a new kind of fluid with high thermal conductivity is a mixture of solid nanoparticles and a liquid. This review recapitulates the recent progress of the various numerical methods that are used in predicting the influence of several parameters such as type of nanoparticle and host liquid, particle volume concentration, particle size and shape, Brownian diffusion and thermophoresis effect on hydrodynamic and thermal characteristics of convective heat transfer using nanofluids in a lid driven cavity.
{"title":"A Review Study of Numerical Simulation of Lid-Driven Cavity Flow with Nanofluids","authors":"Mustaque Hussain Borbora, B. Vasu, Ali J. Chamkha","doi":"10.1166/jon.2023.1930","DOIUrl":"https://doi.org/10.1166/jon.2023.1930","url":null,"abstract":"Perhaps the most deliberated fluid problem in the field of Computational Fluid Dynamics is the lid driven cavity flow whose simple geometry is used to study the thermal behavior of many engineering applications such as cooling of electronic equipment, solar collectors, thermal storage\u0000 systems, food processing, solar ponds, crystal growth, lubrication technologies and cooling of electrical and mechanical components. Researchers have been devoting much of their time in order to discover innovative methods to enhance the thermal conductivity of conventional fluids. With the\u0000 development of nanotechnology, the concept of nanofluids has gained ground considerably as a new kind of heat transfer fluid. Nanofluid is a new kind of fluid with high thermal conductivity is a mixture of solid nanoparticles and a liquid. This review recapitulates the recent progress of the\u0000 various numerical methods that are used in predicting the influence of several parameters such as type of nanoparticle and host liquid, particle volume concentration, particle size and shape, Brownian diffusion and thermophoresis effect on hydrodynamic and thermal characteristics of convective\u0000 heat transfer using nanofluids in a lid driven cavity.","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":"45807326","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}
L. Syam Sundar, F. Shaik, Munaver Jaman Basheer Ahmed
The water and ethylene glycol based stable rGO/nanodiamond hybrid nanofluids were prepared and used for thermophysical properties analysis. The thermophysical properties were measured experimentally at various particle loadings from 0.2% to 1.0% and various temperatures ranging from 20 to 60 °C. From the measured thermophysical properties the figures-of-merit were analyzed by assuming constant heat flux and turbulent boundary conditions by using different models, and also by assuming the hybrid nanofluids flows through a tube. Results indicate that the thermal conductivity of water and ethylene glycol based hybrid nanofluids at Φ = 1.0% vol. is enhanced about 27.87% and 18.8% at 60 °C; viscosity of water and ethylene glycol based hybrid nanofluids at Φ = 1.0% vol. is also enhanced by 72.15% and 86.62% compared to their base fluids at 20 °C. The density is also increased with an increase of particle loadings, whereas, the specific heat is decreased with a rise of particle loadings. Experimental thermophysical properties are fitted into regression equations by using multi linear regression method. The figures-of-merit of all the prepared hybrid nanofluids show its value is less than one under the used particle loadings and temperatures.
{"title":"Figures-of-Merit Analysis Using the Thermophysical Properties of Water and Ethylene Glycol Based Reduced Graphene Oxide/Nanodiamond Hybrid Nanofluids","authors":"L. Syam Sundar, F. Shaik, Munaver Jaman Basheer Ahmed","doi":"10.1166/jon.2023.1983","DOIUrl":"https://doi.org/10.1166/jon.2023.1983","url":null,"abstract":"The water and ethylene glycol based stable rGO/nanodiamond hybrid nanofluids were prepared and used for thermophysical properties analysis. The thermophysical properties were measured experimentally at various particle loadings from 0.2% to 1.0% and various temperatures ranging from\u0000 20 to 60 °C. From the measured thermophysical properties the figures-of-merit were analyzed by assuming constant heat flux and turbulent boundary conditions by using different models, and also by assuming the hybrid nanofluids flows through a tube. Results indicate that the thermal conductivity\u0000 of water and ethylene glycol based hybrid nanofluids at Φ = 1.0% vol. is enhanced about 27.87% and 18.8% at 60 °C; viscosity of water and ethylene glycol based hybrid nanofluids at Φ = 1.0% vol. is also enhanced by 72.15% and 86.62% compared to their base fluids\u0000 at 20 °C. The density is also increased with an increase of particle loadings, whereas, the specific heat is decreased with a rise of particle loadings. Experimental thermophysical properties are fitted into regression equations by using multi linear regression method. The figures-of-merit\u0000 of all the prepared hybrid nanofluids show its value is less than one under the used particle loadings and temperatures.","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":"43831155","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 effectiveness of combining mini-channel configurations in the presence of phase change material slabs. Different phase change material slabs connected with four mini channels were studied numerically. The Navier-Stokes and energy equations for the flow together with the energy equation for the phase change material considering the two-phase system were solved numerically using the finite element technique. Amongst the parameters investigated in this analysis is the Reynolds number, or in other terms, the flow rate. It is found that heat extraction continues as the flow rate within the microchannel increases until the velocity and thermal boundary layers have fully developed. When these layers are fully grown, adding slabs of phase change materials to the system allows for even more heat extraction. Therefore, a combination of mini-channel and phase change material is the best solution for combined heat extraction from a hot surface. This is especially true for circulating flows near the creeping flow with a low Reynolds number.
{"title":"Thermo-Hydraulic Performance of Mini Channels in the Presence of Nanoparticles Phase Change Material Slab","authors":"M. Z. Saghir, M. Rahman","doi":"10.1166/jon.2023.1954","DOIUrl":"https://doi.org/10.1166/jon.2023.1954","url":null,"abstract":"In this paper, we investigate the effectiveness of combining mini-channel configurations in the presence of phase change material slabs. Different phase change material slabs connected with four mini channels were studied numerically. The Navier-Stokes and energy equations for the flow\u0000 together with the energy equation for the phase change material considering the two-phase system were solved numerically using the finite element technique. Amongst the parameters investigated in this analysis is the Reynolds number, or in other terms, the flow rate. It is found that heat\u0000 extraction continues as the flow rate within the microchannel increases until the velocity and thermal boundary layers have fully developed. When these layers are fully grown, adding slabs of phase change materials to the system allows for even more heat extraction. Therefore, a combination\u0000 of mini-channel and phase change material is the best solution for combined heat extraction from a hot surface. This is especially true for circulating flows near the creeping flow with a low Reynolds number.","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":"43456992","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 present study intends to explore heat transfer characteristics of the unsteady natural convective flow of Cu–Al2O3/water hybrid nanofluid due to exponentially accelerated vertical plate. 2D Laminar viscous incompressible boundary layer fluid flow is considered in the presence of MHD and accelerating parameter. The governing partial differential equations with appropriate boundary conditions are solved using the Crank-Nicolson numerical technique. Plots for skin friction coefficient, velocity, temperature, Nusselt number concerning Magnetic parameter (M), Accelerating parameter (a), Grashof number (Gr), Volume fraction (Φ2), and time are disclosed. The study imparted that Cu–Al2O3 hybrid nanoparticles with water as base fluid facilitate a higher heat transfer rate and soaring Nusselt number compared to nanofluid Cu/water. Furthermore, we found an elevated skin friction coefficient in nanofluid Cu/water than in hybrid nanofluid Cu–Al2O3/water in all non-dimensional parameters.
{"title":"Unsteady Magnetohydrodynamic (MHD) Cu–Al2O3/Water Hybrid Nanofluid Flow and Heat Transfer from an Exponentially Accelerated Plate","authors":"C. Sridevi, A. Sailakumari","doi":"10.1166/jon.2023.1955","DOIUrl":"https://doi.org/10.1166/jon.2023.1955","url":null,"abstract":"The present study intends to explore heat transfer characteristics of the unsteady natural convective flow of Cu–Al2O3/water hybrid nanofluid due to exponentially accelerated vertical plate. 2D Laminar viscous incompressible boundary layer fluid flow is considered\u0000 in the presence of MHD and accelerating parameter. The governing partial differential equations with appropriate boundary conditions are solved using the Crank-Nicolson numerical technique. Plots for skin friction coefficient, velocity, temperature, Nusselt number concerning Magnetic parameter\u0000 (M), Accelerating parameter (a), Grashof number (Gr), Volume fraction (Φ2), and time are disclosed. The study imparted that Cu–Al2O3 hybrid nanoparticles with water as base fluid facilitate a higher heat transfer rate and soaring Nusselt number\u0000 compared to nanofluid Cu/water. Furthermore, we found an elevated skin friction coefficient in nanofluid Cu/water than in hybrid nanofluid Cu–Al2O3/water in all non-dimensional 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":"43632028","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 current analysis, A numerical approach for magnetohydrodynamics Stagnation point flow of Micropolar fluid due to a vertical stretching Surface is reported. The impact of buoyancy forces is considered. In additions the effects of the thermal radiation and thermal conductivity with non-zero mass flux have been analyzed. we implement the dimensionless variable technique and the systems of coupled non-linear PDEs are transformed into ODEs by using the appropriate similarity technique. Moreover, by using package ND-Solve on Mathematica problem is numerically integrated with the help of shooting technique. Numerical approach for magnetohydrodynamics Stagnation point flow of thermal Radiative Micropolar fluid due to a vertical stretching Surface. The impact of thermophoresis and Brownian motion are considered. We implement the dimensionless variable technique and the systems of coupled non-linear PDEs are transformed into ODEs by using the appropriate similarity technique. To observe the influence of the physical parameters, graphically valuations are performed for numerous emerging parameters like Brownian motion, mixed convection parameters, thermophoresis diffusion, Hartman number, Radiation parameter, Prandtl number, Stretching parameter and other dimension less parameters. These several protuberant parameters of interest are engaged for velocity, temperature and nonlinear micro rotation profile and studied in detail.
{"title":"A Computational Study on Magnetohydrodynamics Stagnation Point Flow of Micropolar Fluids with Buoyancy and Thermal Radiation due to a Vertical Stretching Surface","authors":"M. Jawad","doi":"10.1166/jon.2023.1958","DOIUrl":"https://doi.org/10.1166/jon.2023.1958","url":null,"abstract":"In current analysis, A numerical approach for magnetohydrodynamics Stagnation point flow of Micropolar fluid due to a vertical stretching Surface is reported. The impact of buoyancy forces is considered. In additions the effects of the thermal radiation and thermal conductivity with\u0000 non-zero mass flux have been analyzed. we implement the dimensionless variable technique and the systems of coupled non-linear PDEs are transformed into ODEs by using the appropriate similarity technique. Moreover, by using package ND-Solve on Mathematica problem is numerically integrated\u0000 with the help of shooting technique. Numerical approach for magnetohydrodynamics Stagnation point flow of thermal Radiative Micropolar fluid due to a vertical stretching Surface. The impact of thermophoresis and Brownian motion are considered. We implement the dimensionless variable technique\u0000 and the systems of coupled non-linear PDEs are transformed into ODEs by using the appropriate similarity technique. To observe the influence of the physical parameters, graphically valuations are performed for numerous emerging parameters like Brownian motion, mixed convection parameters,\u0000 thermophoresis diffusion, Hartman number, Radiation parameter, Prandtl number, Stretching parameter and other dimension less parameters. These several protuberant parameters of interest are engaged for velocity, temperature and nonlinear micro rotation profile and studied in detail.","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":"42508927","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}
Soumia Baali Cherif, I. Rahmoune, S. Bougoul, Ali J. Chamkha
A three-dimensional investigation of mixed convection which occurs from Al2O3-water nanofluid flow in tube of a reduced solar collector and free convection in air gap situated between cover of solar collector and its absorber was investigated. Heat transmission by conduction in absorber and cover as well as thermal losses to exterior expressed in form of a convective flux have also been taken into account. The different transport equations were solved using CFD-Fluent software which is founded on finite volume method and Boussinesq’s law was introduced to take into account of buoyancy effects. In this investigation, thermal efficiency of solar collector was evaluated and use of nanofluids allows to increase this parameter which is generally low for this kind of thermal systems. Length of thermal regime established in the tube is proposed and this investigation is extended relative to other works developed in this research field. Results obtained gave an idea about the flow structure of the fluid under consideration in a tube of a solar collector and heat transmission mechanisms in air gap and in other elements of the solar collector. These results can facilitate design of this thermal system.
{"title":"Analysis of Mixed Convection and Free Convection in a Reduced Solar Collector Using a Nanofluid as Heat Transfer Fluid","authors":"Soumia Baali Cherif, I. Rahmoune, S. Bougoul, Ali J. Chamkha","doi":"10.1166/jon.2023.2005","DOIUrl":"https://doi.org/10.1166/jon.2023.2005","url":null,"abstract":"A three-dimensional investigation of mixed convection which occurs from Al2O3-water nanofluid flow in tube of a reduced solar collector and free convection in air gap situated between cover of solar collector and its absorber was investigated. Heat transmission\u0000 by conduction in absorber and cover as well as thermal losses to exterior expressed in form of a convective flux have also been taken into account. The different transport equations were solved using CFD-Fluent software which is founded on finite volume method and Boussinesq’s law was\u0000 introduced to take into account of buoyancy effects. In this investigation, thermal efficiency of solar collector was evaluated and use of nanofluids allows to increase this parameter which is generally low for this kind of thermal systems. Length of thermal regime established in the tube\u0000 is proposed and this investigation is extended relative to other works developed in this research field. Results obtained gave an idea about the flow structure of the fluid under consideration in a tube of a solar collector and heat transmission mechanisms in air gap and in other elements\u0000 of the solar collector. These results can facilitate design of this thermal 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":"42047087","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 investigation the problem of study is the impacts of viscous dissipation, thermal radiation on the MHD heat transfer flow of Casson fluid across a moving wedge with convective boundary condition in the existence of and internal heat generation/absorption. The governing equations are changed to some coupled differential equations which are not nonlinear with aid of similarity variable. The numerical calculations of the equations are elucidated by the MATLAB package solver bvp5c. The changes of the pertinent constraints on the momentum and temperature have been discussed through graphs and numerical values of skin friction and heat transfer factor are listed in the tabular pattern. The velocity increases and the temperature decreases as λ > 1 increases in the instance λ, also temperature increases with an increase of Radiation parameter.
{"title":"Viscous Dissipation and Radiation Effects on MHD Heat Transfer Flow of Casson Fluid Through a Moving Wedge with Convective Boundary Condition in the Existence of Internal Heat Generation/Absorption","authors":"N. Amar, N. Kishan, B. Shankar Goud","doi":"10.1166/jon.2023.1948","DOIUrl":"https://doi.org/10.1166/jon.2023.1948","url":null,"abstract":"In this investigation the problem of study is the impacts of viscous dissipation, thermal radiation on the MHD heat transfer flow of Casson fluid across a moving wedge with convective boundary condition in the existence of and internal heat generation/absorption. The governing equations\u0000 are changed to some coupled differential equations which are not nonlinear with aid of similarity variable. The numerical calculations of the equations are elucidated by the MATLAB package solver bvp5c. The changes of the pertinent constraints on the momentum and temperature have been discussed\u0000 through graphs and numerical values of skin friction and heat transfer factor are listed in the tabular pattern. The velocity increases and the temperature decreases as λ > 1 increases in the instance λ, also temperature increases with an increase of Radiation\u0000 parameter.","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":"48898195","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 goal of this work is to investigate the effects of thermal radiation on MHD hybrid nanofluid flow over a stretching cylinder immersed in a porous medium. The mathematical model of the physical problem is provided and the resulting governing equations are transformed into the system of non-linear ordinary differential equations using similarity transformation and it is solved numerically by the fourth-order Runge Kutta method combined with the shooting approach using the MATLAB software. The physical impacts of volume fraction, porosity parameter, Forchheimer number, magnetic field, wall temperature parameter, and radiation factor on the hybrid nanofluid flow are interpreted by graphs and tables. Moreover, the skin friction and heat transfer rate of the engineered fluid are discussed. In addition, the current work is in good accord with past studies. It is observed that the volume concentration of Cu gradually dominates the flow field, causing the skin friction and heat transfer rate to be reduced. Also, it is found that the skin friction coefficient and heat transfer rate are enhanced by the increase in Darcy and Farchheimer numbers.
{"title":"Numerical Investigation on Nonlinear Radiative Magneto Hydrodynamics Hybrid Nanofluid Flow Past a Stretching Cylinder Embedded in Porous Medium","authors":"M. Ismail, David Maxim Gururaj","doi":"10.1166/jon.2023.1962","DOIUrl":"https://doi.org/10.1166/jon.2023.1962","url":null,"abstract":"The goal of this work is to investigate the effects of thermal radiation on MHD hybrid nanofluid flow over a stretching cylinder immersed in a porous medium. The mathematical model of the physical problem is provided and the resulting governing equations are transformed into the system\u0000 of non-linear ordinary differential equations using similarity transformation and it is solved numerically by the fourth-order Runge Kutta method combined with the shooting approach using the MATLAB software. The physical impacts of volume fraction, porosity parameter, Forchheimer number,\u0000 magnetic field, wall temperature parameter, and radiation factor on the hybrid nanofluid flow are interpreted by graphs and tables. Moreover, the skin friction and heat transfer rate of the engineered fluid are discussed. In addition, the current work is in good accord with past studies. It\u0000 is observed that the volume concentration of Cu gradually dominates the flow field, causing the skin friction and heat transfer rate to be reduced. Also, it is found that the skin friction coefficient and heat transfer rate are enhanced by the increase in Darcy and Farchheimer numbers.","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":"46879786","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 gravity modulation and rotation on thermal instability in a horizontal layer of a nanofluid. Finite amplitudes have been derived using the minimal Fourier series expressions of physical variables in the presence of modulation and slow time. Here we incorporates the layer of nanofluid with effect of Brownian motion along with thermophoresis. Heat and mass transfer are evaluated in terms of finite amplitudes and calculated by Nusselt numbers for fluid and concentration. It is found that, gravity modulation and rotation can be used effectively to regulate heat and mass transfer. This modulation can be easily felt by shaking the layer vertically with sinusoidal manner. The numerical results are obtained for amplitude of modulation and presented graphically. It is found that rotation and frequency of modulation delays the rate of heat and mass transfer. This shows that a stabilizing nature of gravity modulation and rotation against a non rotating system. A comparison made between modulated and unmodulated and found that modulated system influence the stability problem than un modulated system. Similarly modulated system transfer more heat mass transfer than unmodulated case. Finally we have drawn streamlines and nanoparticle isotherms to show the convective phenomenon.
{"title":"Study of Heat and Mass Transfer in a Rotating Nanofluid Layer Under Gravity Modulation","authors":"S. H. Manjula, P. Kiran, S. Gaikwad","doi":"10.1166/jon.2023.1971","DOIUrl":"https://doi.org/10.1166/jon.2023.1971","url":null,"abstract":"In this paper we investigate the effect of gravity modulation and rotation on thermal instability in a horizontal layer of a nanofluid. Finite amplitudes have been derived using the minimal Fourier series expressions of physical variables in the presence of modulation and slow time.\u0000 Here we incorporates the layer of nanofluid with effect of Brownian motion along with thermophoresis. Heat and mass transfer are evaluated in terms of finite amplitudes and calculated by Nusselt numbers for fluid and concentration. It is found that, gravity modulation and rotation can be used\u0000 effectively to regulate heat and mass transfer. This modulation can be easily felt by shaking the layer vertically with sinusoidal manner. The numerical results are obtained for amplitude of modulation and presented graphically. It is found that rotation and frequency of modulation delays\u0000 the rate of heat and mass transfer. This shows that a stabilizing nature of gravity modulation and rotation against a non rotating system. A comparison made between modulated and unmodulated and found that modulated system influence the stability problem than un modulated system. Similarly\u0000 modulated system transfer more heat mass transfer than unmodulated case. Finally we have drawn streamlines and nanoparticle isotherms to show the convective phenomenon.","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":"42588003","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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