The study scrutinized MHD and dissipated (SWCNTs-Fe3O4)/C2H6O2 hybrid Casson nanofluids flow over an unsteady stretchable rotating disk with a Cattaneo-Christov heat flux model. By means of proper similarity conversion, the boundary layer flow governing PDEs was changed into systems of dimensionless coupled nonlinear ordinary differential equations. Subsequently, the consequent nonlinear momentum and energy equations with their boundary conditions were worked out numerically employing the spectral quasilinearization method (SQLM). The convergence, stability, and accuracy of the SQLM were established as a computationally efficient method to solve a coupled system of boundary layer problems. It is specified that 5% of SWCNTs, 20% of Fe3O4, and 75% of C2H6O2 being taken for the preparation of (SWCNTs−Fe3O4)/C2H6O2 hybrid nanofluid with shape factor n1 = n2 = 3, and the values of the parameters used are fixed to M = 5, S = 0.5, β = 5, κ = 0.5, Ec = 2, Λ = 2, Pr = 7.3, α = 0.5, δ = 0. The effects of more perceptible parameters on velocity and thermal flow fields were considered and scrutinized carefully via graphs and tables. The results disclose that the momentum and thermal boundary layer thickness markedly declined with more value of the unsteady parameter. The local heat transfer rate improves nearly by 14% as 0.2 volume of Fe3O4 nanoparticles dispersed in 0.05 volume of SWCNTs and 0.75 volume of C2H6O2 nanofluid, hence, in realistic uses adding more values of nanoparticles in the hybrid nanofluids is useful to progress the heating process. The study is novel since to the best of the author’s knowledge, no paper has been published so far on the unsteady flow of (SWNT-Fe3O4)-Ethylene glycol hybrid Casson nanofluid with the effects of the Cattaneo-Christov heat flux model. As well, the model used for the thermophysical properties of the hybrid nanofluid is a new approach. Generally, hybrid nanofluids of (SWCNTs-Fe3O4)/C2H6O2 show better flow distributions with good stability of thermal properties than their mono counterparts.
{"title":"Numerical Analysis of Magnetohydrodynamic and Dissipated Hybrid Casson Nanofluid Flow Over an Unsteady Stretchable Rotating Disk with Cattaneo-Christov Heat Flux Model","authors":"Ayele Tulu","doi":"10.1166/jon.2023.2059","DOIUrl":"https://doi.org/10.1166/jon.2023.2059","url":null,"abstract":"The study scrutinized MHD and dissipated (SWCNTs-Fe3O4)/C2H6O2 hybrid Casson nanofluids flow over an unsteady stretchable rotating disk with a Cattaneo-Christov heat flux model. By means of proper similarity conversion, the boundary layer flow governing PDEs was changed into systems of dimensionless coupled nonlinear ordinary differential equations. Subsequently, the consequent nonlinear momentum and energy equations with their boundary conditions were worked out numerically employing the spectral quasilinearization method (SQLM). The convergence, stability, and accuracy of the SQLM were established as a computationally efficient method to solve a coupled system of boundary layer problems. It is specified that 5% of SWCNTs, 20% of Fe3O4, and 75% of C2H6O2 being taken for the preparation of (SWCNTs−Fe3O4)/C2H6O2 hybrid nanofluid with shape factor n1 = n2 = 3, and the values of the parameters used are fixed to M = 5, S = 0.5, β = 5, κ = 0.5, Ec = 2, Λ = 2, Pr = 7.3, α = 0.5, δ = 0. The effects of more perceptible parameters on velocity and thermal flow fields were considered and scrutinized carefully via graphs and tables. The results disclose that the momentum and thermal boundary layer thickness markedly declined with more value of the unsteady parameter. The local heat transfer rate improves nearly by 14% as 0.2 volume of Fe3O4 nanoparticles dispersed in 0.05 volume of SWCNTs and 0.75 volume of C2H6O2 nanofluid, hence, in realistic uses adding more values of nanoparticles in the hybrid nanofluids is useful to progress the heating process. The study is novel since to the best of the author’s knowledge, no paper has been published so far on the unsteady flow of (SWNT-Fe3O4)-Ethylene glycol hybrid Casson nanofluid with the effects of the Cattaneo-Christov heat flux model. As well, the model used for the thermophysical properties of the hybrid nanofluid is a new approach. Generally, hybrid nanofluids of (SWCNTs-Fe3O4)/C2H6O2 show better flow distributions with good stability of thermal properties than their mono counterparts.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"38 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139328189","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 study of bio-convective flow of hybrid nanofluid attracted many researchers because of tremendous applications in the fields of biofuel biotechnology, enzyme-based biosensors and biomedical science. The present work addresses a comparative study of CuO/Al2O3-water and CuO-water nanoparticles on heat and mass transfer characteristics of the squeezing flow of MHD couple stress fluid between two parallel plates by suspending motile micro-organisms. An approximated numerical technique (Shooting method along with Runge-Kutta 4th order scheme) have been employed to analyse the system of coupled nonlinear ordinary differential equations. The above numerical investigations were carried out for various governing parameters such as couple stress parameter, Hartmann number, bioconvection Peclet number, squeezing parameter etc. The effects of these physical parameters are illustrated graphically over velocity components, temperature distribution, diffusion of concentration and density of motile microorganisms. In addition to this the numerical values of skin friction, the local Nusselt number and local Sherwood number are tabulated at the upper plate for CuO-water and CuO–Al2O3-water at the expanding and squeezing cases. The numerical results for temperature profiles are in good consistency with earlier research.
{"title":"Bio-Convective Hartmann Flow of Couple Stress Hybrid Nanofluid Between Two Dilating Parallel Walls with Heat and Mass Transfer","authors":"A. Raju, O. Ojjela, N. Naresh Kumar, I. Sreenath","doi":"10.1166/jon.2023.2053","DOIUrl":"https://doi.org/10.1166/jon.2023.2053","url":null,"abstract":"The study of bio-convective flow of hybrid nanofluid attracted many researchers because of tremendous applications in the fields of biofuel biotechnology, enzyme-based biosensors and biomedical science. The present work addresses a comparative study of CuO/Al2O3-water and CuO-water nanoparticles on heat and mass transfer characteristics of the squeezing flow of MHD couple stress fluid between two parallel plates by suspending motile micro-organisms. An approximated numerical technique (Shooting method along with Runge-Kutta 4th order scheme) have been employed to analyse the system of coupled nonlinear ordinary differential equations. The above numerical investigations were carried out for various governing parameters such as couple stress parameter, Hartmann number, bioconvection Peclet number, squeezing parameter etc. The effects of these physical parameters are illustrated graphically over velocity components, temperature distribution, diffusion of concentration and density of motile microorganisms. In addition to this the numerical values of skin friction, the local Nusselt number and local Sherwood number are tabulated at the upper plate for CuO-water and CuO–Al2O3-water at the expanding and squeezing cases. The numerical results for temperature profiles are in good consistency with earlier research.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"5 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139329897","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 most well-known research areas in computational fluid dynamics are concerned with the interplay of fluid flow with chemical reaction and activation energy. According to the findings of several studies, its industrial applications include simulating the flow inside a nuclear reactor, for which it has received appreciation from many researchers. This study, driven by the use of flow in industrial challenges, explores the impacts of activation energy and chemical reaction on the magnetohydrodynamic (MHD) Darcy–Forchheimer squeezed Casson fluid flow through a porous material across the horizontal channel. The flow is produced when two horizontal plates are compressed to create more space between them. By using similarity variables, one may successfully convert partial differential equations (PDEs) to ordinary differential equations (ODEs). The shooting technique was used to carry out the numerical analysis, which entailed solving the competent governing equations with dominating parameters for a thin liquid layer. This was done to determine the results of the study. To validate the current solutions, it is vital to evaluate the numerical findings alongside the results of the prior research. The findings indicate that fluid velocity and temperature increases may be expected as the plates are brought closer together. In addition, there was a correlation between a rise in the Hartmann number and a decrease in the fluid’s velocity and concentration because of the existence of strong Lorentz forces. The temperature and the concentration of the liquid will increase due to the Brownian motion. When the Darcy–Forchheimer and activation energy parameters are both increased, the velocity and concentration decrease.
{"title":"Magnetohydrodynamic Darcy-Forchheimer Squeezed Flow of Casson Nanofluid Over Horizontal Channel with Activation Energy and Thermal Radiation","authors":"V. V. L. Deepthi, R. Srinivasa Raju","doi":"10.1166/jon.2023.2054","DOIUrl":"https://doi.org/10.1166/jon.2023.2054","url":null,"abstract":"The most well-known research areas in computational fluid dynamics are concerned with the interplay of fluid flow with chemical reaction and activation energy. According to the findings of several studies, its industrial applications include simulating the flow inside a nuclear reactor, for which it has received appreciation from many researchers. This study, driven by the use of flow in industrial challenges, explores the impacts of activation energy and chemical reaction on the magnetohydrodynamic (MHD) Darcy–Forchheimer squeezed Casson fluid flow through a porous material across the horizontal channel. The flow is produced when two horizontal plates are compressed to create more space between them. By using similarity variables, one may successfully convert partial differential equations (PDEs) to ordinary differential equations (ODEs). The shooting technique was used to carry out the numerical analysis, which entailed solving the competent governing equations with dominating parameters for a thin liquid layer. This was done to determine the results of the study. To validate the current solutions, it is vital to evaluate the numerical findings alongside the results of the prior research. The findings indicate that fluid velocity and temperature increases may be expected as the plates are brought closer together. In addition, there was a correlation between a rise in the Hartmann number and a decrease in the fluid’s velocity and concentration because of the existence of strong Lorentz forces. The temperature and the concentration of the liquid will increase due to the Brownian motion. When the Darcy–Forchheimer and activation energy parameters are both increased, the velocity and concentration decrease.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"11 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326340","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}
To reveal the mechanism of the enhanced heat transfer in nanofluids, Buongiorno (ASME J. Heat Transfer, vol. 128, 2006, pp. 240–250) developed a convective transport model by considering the slip mechanisms of nanoparticles migration. By now, many extended researches are based on his model. Among them, the study on porous medium flow pioneered by Nield & Kuznetsov (Int. J. Heat & Mass Transfer, vol. 52, 2009, pp.5796–5801) has received much attention. Their work employed the Darcy model and Buongiorno’s model to investigate the thermal instability in a horizontal porous medium layer saturated by a nanofluid. Through a sophisticated analysis, they obtained an approximate formula capable of predicting the stability threshold. However, a potential contradiction exists in their analysis owing to an improper assumption about the thermophoretic coefficient, which may lead to an unphysical result. To date, much of current works still adopted this improper assumption in various extended problems. To resolve this contradiction, the present study revises their work by considering the dependence of thermophoretic coefficient on the volume fraction of nanoparticles. A nonlinear basic-state solution of concentration is obtained and then used to implement the linear stability analysis. In comparison with Nield’s formula, the present result shows that the threshold of instability shifts to a lower concentration by more than one order of magnitude. The mechanism causing the shift is discussed and the novelty of the present study is stressed.
为了揭示纳米流体中热传导增强的机理，Buongiorno（《ASME J. Heat Transfer》，第 128 卷，2006 年，第 240-250 页）通过考虑纳米颗粒迁移的滑移机理，建立了一个对流传输模型。到目前为止，许多扩展研究都基于他的模型。其中，Nield & Kuznetsov（《Int. J. Heat & Mass Transfer》，第 52 卷，2009 年，第 5796-5801 页）开创的多孔介质流动研究备受关注。他们的研究采用达西模型和 Buongiorno 模型来研究纳米流体饱和水平多孔介质层的热不稳定性。通过复杂的分析，他们得到了一个能够预测稳定阈值的近似公式。然而，由于对热传导系数的假设不当，他们的分析存在潜在矛盾，可能导致非物理结果。迄今为止，在各种扩展问题中，许多现有研究仍采用了这一不当假设。为了解决这一矛盾，本研究考虑了热泳系数与纳米粒子体积分数的关系，对他们的工作进行了修正。本研究获得了浓度的非线性基态解，然后用它来进行线性稳定性分析。与 Nield 公式相比，本研究结果表明，不稳定性阈值向较低浓度移动了一个数量级以上。本研究讨论了导致这种转变的机制，并强调了本研究的新颖性。
{"title":"A Revised Work on the Rayleigh-Bénard Instability of Nanofluid in a Porous Medium Layer","authors":"A. Ruo, Wei-Mon Yan, Min-Hsing Chang","doi":"10.1166/jon.2023.2052","DOIUrl":"https://doi.org/10.1166/jon.2023.2052","url":null,"abstract":"To reveal the mechanism of the enhanced heat transfer in nanofluids, Buongiorno (ASME J. Heat Transfer, vol. 128, 2006, pp. 240–250) developed a convective transport model by considering the slip mechanisms of nanoparticles migration. By now, many extended researches are based on his model. Among them, the study on porous medium flow pioneered by Nield & Kuznetsov (Int. J. Heat & Mass Transfer, vol. 52, 2009, pp.5796–5801) has received much attention. Their work employed the Darcy model and Buongiorno’s model to investigate the thermal instability in a horizontal porous medium layer saturated by a nanofluid. Through a sophisticated analysis, they obtained an approximate formula capable of predicting the stability threshold. However, a potential contradiction exists in their analysis owing to an improper assumption about the thermophoretic coefficient, which may lead to an unphysical result. To date, much of current works still adopted this improper assumption in various extended problems. To resolve this contradiction, the present study revises their work by considering the dependence of thermophoretic coefficient on the volume fraction of nanoparticles. A nonlinear basic-state solution of concentration is obtained and then used to implement the linear stability analysis. In comparison with Nield’s formula, the present result shows that the threshold of instability shifts to a lower concentration by more than one order of magnitude. The mechanism causing the shift is discussed and the novelty of the present study is stressed.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"18 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139325728","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}
S. El-Kabeir, A. Rashad, H. EL-Mky, Shereen Abd Elnaem
The diluted suspension of nanoparticles in base liquids has been found in extensive applications in various industrial processes like nanomedicines, cooling of microsystems, and energy conversion. The idea of tri-hybrid nanofluid have been developed which shows the impact of three nanoparticles at the same time in a single fluid. This newly developed tri-hybrid mixture model getting more attention and performed better than hybrid and nanofluid. Owing to its important applications an attempt has made in this article to investigate the Casson ternary hybrid nanofluids flow along a stretching cylinder through porous medium subject to the influence of microorganism in the modeled equations. The strength of magnetic field has employed in upward direction of the flow system, and Activation Energy effect is addressed. The main equations of fluid motion have been converted to dimensionless format using set of suitable variables. In this work it has noticed that, growth in permeability parameter, Casson and magnetic factors result in more resistive force to fluid motion that declines the velocity characteristics. Moreover, the temperature distribution has grown up while the concentration characteristics have declined with growing values of Brownian factor. Furthermore, microorganism characteristics decay with growth in bio-convection Lewis and Peclet numbers. The impact of these parameters upon heat, mass and motile transfer rates has been evaluated in the tabular form.
{"title":"Magneto-Ternary Hybrid Nanofluid Flow About Stretching Cylinder in a Porous Medium with Gyrotactic Microorganism","authors":"S. El-Kabeir, A. Rashad, H. EL-Mky, Shereen Abd Elnaem","doi":"10.1166/jon.2023.2068","DOIUrl":"https://doi.org/10.1166/jon.2023.2068","url":null,"abstract":"The diluted suspension of nanoparticles in base liquids has been found in extensive applications in various industrial processes like nanomedicines, cooling of microsystems, and energy conversion. The idea of tri-hybrid nanofluid have been developed which shows the impact of three nanoparticles at the same time in a single fluid. This newly developed tri-hybrid mixture model getting more attention and performed better than hybrid and nanofluid. Owing to its important applications an attempt has made in this article to investigate the Casson ternary hybrid nanofluids flow along a stretching cylinder through porous medium subject to the influence of microorganism in the modeled equations. The strength of magnetic field has employed in upward direction of the flow system, and Activation Energy effect is addressed. The main equations of fluid motion have been converted to dimensionless format using set of suitable variables. In this work it has noticed that, growth in permeability parameter, Casson and magnetic factors result in more resistive force to fluid motion that declines the velocity characteristics. Moreover, the temperature distribution has grown up while the concentration characteristics have declined with growing values of Brownian factor. Furthermore, microorganism characteristics decay with growth in bio-convection Lewis and Peclet numbers. The impact of these parameters upon heat, mass and motile transfer rates has been evaluated in the tabular form.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"4 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139330339","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}
Sandipkumar Sonawane, Suyash Y. Pawar, Ali J. Chamkha, V. Kolhe, R. Kings Krishna Nagarajasingh, K. Chandratre, Hitendra Kumar Lature, Satish J. Suryawanshi, J. Sunil
The research investigates brine-based metal oxide nanofluids to improve heat transfer and ice plant COP. The novelty of the study is in the use of stable nanofluids of ZnO, CuO, and Al2O3 prepared using surfactants and ultra-sonication to improve the performance of an ice plant working on the vapor compression refrigeration cycle. The study found that the COP of the ice plant was significantly enhanced using these nanofluids, with the greatest improvement of 27% observed for Al2O3 nanofluids at a particle volume concentration of 0.3%. The experiment also showed a reduction in compressor power consumption by 22% at the same concentration and temperature, indicating the potential use of these nanofluids in ice plant applications. The study further demonstrated that the COP improvement was more significant at a controlled temperature of 20 °C than at 25 °C.
该研究调查了基于盐水的金属氧化物纳米流体，以改善传热和制冰厂的 COP。这项研究的新颖之处在于使用表面活性剂和超声波制备稳定的氧化锌、氧化铜和氧化铝纳米流体，以改善采用蒸汽压缩制冷循环的制冰厂的性能。研究发现，使用这些纳米流体可显著提高制冰厂的 COP，其中颗粒体积浓度为 0.3% 的 Al2O3 纳米流体的改善幅度最大，达到 27%。实验还显示，在相同的浓度和温度下，压缩机功耗降低了 22%，这表明这些纳米流体在制冰厂的应用具有潜力。研究进一步表明，在 20 °C 的受控温度下，COP 的改善比 25 °C 时更为显著。
{"title":"Experimental Investigation of Coefficient of Performance Enhancement (COP) in Ice Plant Using Brine-Based Metal Oxide Nanofluids","authors":"Sandipkumar Sonawane, Suyash Y. Pawar, Ali J. Chamkha, V. Kolhe, R. Kings Krishna Nagarajasingh, K. Chandratre, Hitendra Kumar Lature, Satish J. Suryawanshi, J. Sunil","doi":"10.1166/jon.2023.2101","DOIUrl":"https://doi.org/10.1166/jon.2023.2101","url":null,"abstract":"The research investigates brine-based metal oxide nanofluids to improve heat transfer and ice plant COP. The novelty of the study is in the use of stable nanofluids of ZnO, CuO, and Al2O3 prepared using surfactants and ultra-sonication to improve the performance of an ice plant working on the vapor compression refrigeration cycle. The study found that the COP of the ice plant was significantly enhanced using these nanofluids, with the greatest improvement of 27% observed for Al2O3 nanofluids at a particle volume concentration of 0.3%. The experiment also showed a reduction in compressor power consumption by 22% at the same concentration and temperature, indicating the potential use of these nanofluids in ice plant applications. The study further demonstrated that the COP improvement was more significant at a controlled temperature of 20 °C than at 25 °C.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"19 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139331055","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 of the present study is to explore the flow of Jeffrey hybrid nanofluid crossing through a moving porous surface with the existance of magnetic field, heat sink/source, yield stress and chemical reaction impact. Nusselt number is characterized by the process of thermal radiation. The partial equations are governed during the moved coordinate’s porous regime that is depicting the flow for Buongiorno’s model. Employing similarity transformations, the obtained equations were turned into non-linear ordinary differential equations. The controlled equations were solved by RKF45 via shooting technique. The focus is in examining physical characteristics such as heat flux at the wall, temperature distribution, velocity of flow, and surface friction for a variety of related parameters. The analysis explained that higher permeability and parameters of yield stress, generation of heat and magnetic field enhance distribution of temperature and slow down the heat transfer. The mass transport is upsurged with increasing chemical reaction and heat source. The model is prepared as an application in processes of thermal engineering.
{"title":"Yield Stress Impact on Magnetohydrodynamic Jeffery Hybrid Nanofluid Flow Over a Moving Porous Surface: Buongiorno’s Model","authors":"A. Rashad, Mohamed A. Nafe, D. Eisa","doi":"10.1166/jon.2023.2057","DOIUrl":"https://doi.org/10.1166/jon.2023.2057","url":null,"abstract":"The main goal of the present study is to explore the flow of Jeffrey hybrid nanofluid crossing through a moving porous surface with the existance of magnetic field, heat sink/source, yield stress and chemical reaction impact. Nusselt number is characterized by the process of thermal radiation. The partial equations are governed during the moved coordinate’s porous regime that is depicting the flow for Buongiorno’s model. Employing similarity transformations, the obtained equations were turned into non-linear ordinary differential equations. The controlled equations were solved by RKF45 via shooting technique. The focus is in examining physical characteristics such as heat flux at the wall, temperature distribution, velocity of flow, and surface friction for a variety of related parameters. The analysis explained that higher permeability and parameters of yield stress, generation of heat and magnetic field enhance distribution of temperature and slow down the heat transfer. The mass transport is upsurged with increasing chemical reaction and heat source. The model is prepared as an application in processes of thermal engineering.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"116 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139331321","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}
R. Hemalatha, P. K. Kameswaran, P. V. Murthy, S. Gunakala
The main aim of the present article to study the thermal dispersion, thermal radiation and magnetic effects on the mixed convective flow of nanoparticles and its shape effects on vertical cylinder. The governing equations are solved and numerically solved by using shooting technique. The thermal dispersion and thermal radiation on velocity, temperaure and heat transfer for different shapes of nanoparticles are depicted graphically.
{"title":"Shape Impacts of Nanoparticles on Mixed Convective Flow Over a Vertical Cylinder with Thermal Dispersion","authors":"R. Hemalatha, P. K. Kameswaran, P. V. Murthy, S. Gunakala","doi":"10.1166/jon.2023.2056","DOIUrl":"https://doi.org/10.1166/jon.2023.2056","url":null,"abstract":"The main aim of the present article to study the thermal dispersion, thermal radiation and magnetic effects on the mixed convective flow of nanoparticles and its shape effects on vertical cylinder. The governing equations are solved and numerically solved by using shooting technique. The thermal dispersion and thermal radiation on velocity, temperaure and heat transfer for different shapes of nanoparticles are depicted graphically.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"6 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139328531","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 article deals with the analysis of the thermal-diffusion effect, chemical reaction and heat generation on the convective hydromagnetic flow of water-based nanofluid past an instantaneously accelerated infinite vertical plate nested in a porous medium. Simultaneous application of ramped temperature, ramped velocity, and ramped concentration has been considered. With the help of Laplace transformation, the set of transformed domain equations has been resolved. The consequences of various flow parameters involved in the study are analysed graphically. The results exhibit that the hydrodynamic and solutal boundary layer elevates for the higher value of the Soret effect Sr. Moreover, the rate of heat transfer hikes and on the other hand, the rate of mass transfer drops on account of the volume concentration of nanoparticles φ. Again, it is observed that the temperature, concentration and velocity field are dominated in the ramped condition by that of the isothermal condition.
本文分析了水基纳米流体流经嵌套在多孔介质中的瞬时加速无限垂直板时的热扩散效应、化学反应和热量产生。研究考虑了同时应用斜坡温度、斜坡速度和斜坡浓度的问题。在拉普拉斯变换的帮助下，解决了变换域方程组。对研究中涉及的各种流动参数的后果进行了图解分析。结果表明，索雷特效应 Sr 值越高，流体力学和溶质边界层越高。此外，传热速率上升，另一方面，纳米粒子的体积浓度 φ 导致传质速率下降。同样，在斜坡条件下，温度场、浓度场和速度场都受等温条件下的温度场、浓度场和速度场的支配。
{"title":"Soret Effect with Chemical Reaction on Unsteady MHD Flow of Nanofluid Past an Impulsively Started Infinite Vertical Plate Embedded in a Porous Medium","authors":"D. Gohain, R. Bordoloi, N. Ahmed","doi":"10.1166/jon.2023.2058","DOIUrl":"https://doi.org/10.1166/jon.2023.2058","url":null,"abstract":"This article deals with the analysis of the thermal-diffusion effect, chemical reaction and heat generation on the convective hydromagnetic flow of water-based nanofluid past an instantaneously accelerated infinite vertical plate nested in a porous medium. Simultaneous application of ramped temperature, ramped velocity, and ramped concentration has been considered. With the help of Laplace transformation, the set of transformed domain equations has been resolved. The consequences of various flow parameters involved in the study are analysed graphically. The results exhibit that the hydrodynamic and solutal boundary layer elevates for the higher value of the Soret effect Sr. Moreover, the rate of heat transfer hikes and on the other hand, the rate of mass transfer drops on account of the volume concentration of nanoparticles φ. Again, it is observed that the temperature, concentration and velocity field are dominated in the ramped condition by that of the isothermal condition.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"31 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139329660","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}
Heat transfer and convective flow of Cu–H2O nanofluid in a microchannel with thermal radiation has many attributes in engineering, industries, and biomedical sciences including cooling of electronics, drug delivery, cancer therapy, optics, missiles, satellites, and lubricants. Therefore, this paper aims to investigate the hydrodynamical behaviors and heat transfer characteristics of Cu–H2O nanofluid through a porous medium microchannel with thermal radiation and convective heating. The highly non-linear partial differential equations that govern the momentum and energy equations are formulated, non-dimensionalized, transformed into ordinary differential equations and solved numerically via the fourth order Runge-Kutta integration scheme. Consequently, the numerical simulation reveals that the nanofluid velocity and temperature profiles show a rising pattern with increasing values of the pressure gradient parameter, variable viscosity parameter, Darcy number, thermal Grashof number and Eckert number. The temperature profile escalates with the Prandtl number however it diminishes with the Biot number, Forchheimer number, suction/injection Reynolds number and nanoparticles volume fraction. Furthermore, the thermal radiation parameter indicates a retarding effect on the temperature profile and hence, radiation quite effectively controls the microchannel temperature distribution which plays a significant role in cooling the flow transport system. The skin friction coefficient at both microchannel walls indicates a rising pattern with the suction/injection Reynolds number, thermal Grashof number, Eckert number and Darcy number. Moreover, at both microchannel walls the heat transfer rate enhances for large values of the suction/injection Reynolds number, thermal Grashof number, Eckert number, variable viscosity parameter and Darcy number whereas it decreases with the thermal radiation parameter, Forchheimer number and nanoparticles volume fraction. The Biot number reveals an opposite effect on the heat transfer rate at the left and right walls of the microvhannel.
{"title":"Mixed Convection of Cu–H2O Nanofluid in a Darcy–Forchheimer Porous Medium Microchannel with Thermal Radiation and Convective Heating","authors":"Ebba Hindebu Rikitu, O. Makinde","doi":"10.1166/jon.2023.2097","DOIUrl":"https://doi.org/10.1166/jon.2023.2097","url":null,"abstract":"Heat transfer and convective flow of Cu–H2O nanofluid in a microchannel with thermal radiation has many attributes in engineering, industries, and biomedical sciences including cooling of electronics, drug delivery, cancer therapy, optics, missiles, satellites, and lubricants. Therefore, this paper aims to investigate the hydrodynamical behaviors and heat transfer characteristics of Cu–H2O nanofluid through a porous medium microchannel with thermal radiation and convective heating. The highly non-linear partial differential equations that govern the momentum and energy equations are formulated, non-dimensionalized, transformed into ordinary differential equations and solved numerically via the fourth order Runge-Kutta integration scheme. Consequently, the numerical simulation reveals that the nanofluid velocity and temperature profiles show a rising pattern with increasing values of the pressure gradient parameter, variable viscosity parameter, Darcy number, thermal Grashof number and Eckert number. The temperature profile escalates with the Prandtl number however it diminishes with the Biot number, Forchheimer number, suction/injection Reynolds number and nanoparticles volume fraction. Furthermore, the thermal radiation parameter indicates a retarding effect on the temperature profile and hence, radiation quite effectively controls the microchannel temperature distribution which plays a significant role in cooling the flow transport system. The skin friction coefficient at both microchannel walls indicates a rising pattern with the suction/injection Reynolds number, thermal Grashof number, Eckert number and Darcy number. Moreover, at both microchannel walls the heat transfer rate enhances for large values of the suction/injection Reynolds number, thermal Grashof number, Eckert number, variable viscosity parameter and Darcy number whereas it decreases with the thermal radiation parameter, Forchheimer number and nanoparticles volume fraction. The Biot number reveals an opposite effect on the heat transfer rate at the left and right walls of the microvhannel.","PeriodicalId":47161,"journal":{"name":"Journal of Nanofluids","volume":"71 1","pages":""},"PeriodicalIF":4.1,"publicationDate":"2023-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139326916","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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