Significance of haphazard motion and thermal migration of alumina and copper nanoparticles across the dynamics of water and ethylene glycol on a convectively heated surface

This article studies the effect of thermal radiation on a MHD free convection flow of a nanofluid bounded by a semi-infinite vertical plate with a constant heat source in a rotating frame of reference. The plate is assumed to oscillate in time with constant frequency so that the solutions of the boundary layer are the same oscillatory type. The dimensionless governing equations for this investigation are solved analytically using the regular perturbation method. The effect of various important parameters entering into the problem on velocity and temperature fields within the boundary layer are discussed for three different water-based nanofluids such as Cu, Al2O3, and TiO2 with the help of graphs. The predicted results clearly indicate that the presence of nanoparticles in the base fluid enhances the heat transfer process significantly. The present work shows the need for immediate attention in next-generation solar film collectors, heat-exchanger technology, material processing exploiting vertical surface, geothermal energy storage, and all those processes which are greatly exaggerated by heat-enhancement concepts. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21101

Thermal Radiation and Heat Source Effects on a MHD Nanofluid Past a Vertical Plate in a Rotating System with Porous Medium

This article investigates unsteady magnetohydrodynamic (MHD) mixed convective and thermally radiative Jeffrey nanofluid flow in view of a vertical stretchable cylinder with radiation absorption and heat; the reservoir was addressed. The mathematical formulation of Jeffrey nanofluid is established based on the theory of boundary layer approximations pioneered by Prandtl. The governing model expressions in partial differential equations (PDEs) form was transformed into dimensionless form via similarity transformation technique. The set of nonlinear nondimensional partial differential equations are solved with the help of the homotopic analysis method. For the purpose of accuracy, the optimizing system parameters, convergence, and stability analysis of the analytical algorithm (CSA) were performed graphically. The velocity, temperature, and concentration flow are studied and shown graphically with the effect of system parameters such as Grashof number, Hartman number, Prandtl number, thermal radiation, Schmidt number, Eckert number, Deborah number, Brownian parameter, heat source parameter, thermophoresis parameter, and stretching parameter. Moreover, the consequence of system parameters on skin friction coefficient, Nusselt number, and Sherwood number is also examined graphically and discussed.

https://www.mdpi.com/2079-6412/11/3/353/pdf

Effects of Joule Heating and Viscous Dissipation on Magnetohydrodynamic Boundary Layer Flow of Jeffrey Nanofluid over a Vertically Stretching Cylinder

The aim of this research paper is to study the effect of thermal diffusion (Soret) on unsteady magnetohydrodynamic mixed convection flow through an accelerated vertical wavy plate embedded in a darcian porous medium. Fundamental coupled non-linear partial differential equations with fitting boundary conditions control the flow problem. Efficient, stable, and finite element technique providing excellent convergence and versatility in accepting coupled systems of ordinary and partial differential equations is used to obtain numerical solutions for these partial differential equations. Graphical results for velocity, temperature, and concentration fields are discussed and displayed. The effects of emerging parameters on the Skin-friction are arrived at using comprehensive parametric tests. Rate of heat and mass transfer coefficients are graphically represented and examined. The results match with a special case of previously published work. From the present analysis it is reported that the presence of angle of inclination sustains a retarding effect on velocity. The velocity decreases with increasing magnetic field parameter, while the Dufour number and Soret number increase with increasing the same and the concentration field decrease as the Schmidt number increases while the temperature field decreases with increasing Prandtl number and Dufour number.

Double diffusive effects on mixed convection Casson fluid flow past a wavy inclined plate in presence of Darcian porous medium

Magnetohydrodynamic bio‐nanoconvective Naiver slip flow of micropolar fluid in a stretchable horizontal channel

MHD oscillatory flow of a Jeffrey fluid in a vertical porous channel with viscous dissipation

This paper looks at heat and mass transfer effects on an unsteady MHD flow of a couple-stress fluid in a horizontal wavy porous space with travelling thermal waves in the presence of a heat source and viscous dissipation. Initially the temperatures of the walls are maintained at different constant temperatures. The analytical expressions for velocity, temperature, and concentration field are obtained by the regular perturbation technique. The results are presented graphically for various values of emerging dimensionless parameters of the problem and are discussed to show interesting aspects of the solution. © 2013 Wiley Periodicals, Inc. Heat Trans Asian Res 42(5): 403–421, 2013; Published online 8 April 2013 in Wiley Online Library (wileyonlinelibrary.com/journal/htj). DOI 10.1002/htj.21040

Heat and mass transfer effects on MHD flow of a couple‐stress fluid in a horizontal wavy channel with viscous dissipation and porous medium

The influence of thermophoretic particle deposition on fully developed MHD mixed convective flow in a vertical channel with thermal-diffusion and diffusion-thermo effects

This work is concerned with MHD Casson nanofluid flow in a vertical porous space with heat and mass transfer in the presence of chemical reaction. The governing non-linear partial differential equations are reduced to ordinary differential equation by employing the similarity transformations then it solved by homotopy analysis method (HAM). The results are presented with the help of graphs for different values of the involved parameters and discussed. It is found that increasing Brownian motion parameter, thermophoresis parameter and Prandtl number are lead to promote fluid temperature significantly than other parameters. Also, it is observed that increasing Lewis number lead to enhance the concentration field whereas the opposite trend can be noticed with increasing thermal parameters. Further, we have compared HAM solution with the numerical solution by using ND solver in Mathematica.

/pdf/thermo-dynamic-analysis-on-mhd-casson-nano-fluid-flow-in-a-115fqxa813.pdf

Thermo Dynamic Analysis on MHD Casson Nano-Fluid Flow in a Vertical Porous Space with Stretching Walls

This paper investigates the influence of variable viscosity and Soret effect on MHD Jeffrey fluid flow in a vertical porous channel in the presence of radiation and wall slip condition. The highly nonlinear coupled differential equations governing the momentum, energy and concentration fields are solved by using perturbation technique. The expressions for velocity, temperature and concentration have been constructed and the effects of pertinent parameters on flow, heat and mass transfer characteristics are discussed with the aid of figures. It is found that, increasing slip parameter, Prandtl number and magnetic parameter tends to enhance pressure gradient while radiation parameter lead to suppress pressure gradient. It is also observed that slip parameter and magnetic parameter tends to reduce total rate heat significantly but the opposite trend can be noticed with increasing Soret number and viscosity parameter. Due to increase of slip parameter, total rate species added to the fluid decreases whereas the reverse effect can be observed with increasing material parameter. In addition, increasing material parameter is lead to enhance the skin friction at the right wall while this behavior is reversed with an increase of Grashof number.

R.K. Selvi

Papers

MHD oscillatory flow of a Jeffrey fluid in a vertical porous channel with viscous dissipation

Heat and mass transfer effects on MHD flow of a couple‐stress fluid in a horizontal wavy channel with viscous dissipation and porous medium

The influence of thermophoretic particle deposition on fully developed MHD mixed convective flow in a vertical channel with thermal-diffusion and diffusion-thermo effects

Thermo Dynamic Analysis on MHD Casson Nano-Fluid Flow in a Vertical Porous Space with Stretching Walls

Radiation Effects on MHD Convective Flow of a Jeffrey Fluid in A Vertical Porous Channel with Soret Effect