Radiation effect on mixed convection flow of nanofluid between two concentric cylinders with Hall and Ion-slip effects

This paper analyzes the effects of thermal radiation, Hall and ion slip parameter on mixed convective nanofluid flow in an annuli between two concentric cylinders in the existence of strong magnetic field. The nonlinear governing equations are non-dimensionalized and then solved by using homotopy analysis method. The influence of radiation, magnetic, Hall and ion slip parameters on the velocity, temperature, nanoparticle concentration, Nusselt number and nanoparticle Sherwood number are investigated and represented graphically

Soret and Dufour effects on mixed convection in a non-Darcy porous medium saturated with micropolar fluid

In this paper, the Soret and Dufour effects on the steady, laminar mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a non-Darcy porous medium saturated with micropolar fluid are studied. The governing partial differential equations are transformed into ordinary differential equations. The local similarity solutions of the transformed dimensionless equations for the flow, microrotation, heat and mass transfer characteristics are evaluated using Keller-box method. Numerical results are presented in the form of velocity, microrotation, temperature and concentration profiles within the boundary layer for different parameters entering into the analysis. Also the effects of the pertinent parameters on the local skin friction coefficient and rates of heat and mass transfer in terms of the local Nusselt and Sherwood numbers are also discussed

MHD Boundary Layer Flow of a Nanofluid Past a Wedge

AbstractThis paper analyzes the steady laminar magnetohydrodynamic (MHD) flow, heat and mass transfer characteristics in a nanofluid over a wedge in the presence of a variable magnetic field. The governing nonlinear partial differential equations are transformed into a system of ordinary differential equations using similarity variables and then solved numerically by using spectral quasi linearization method (SQLM). The present numerical results are validated by favourable comparisons with previously published ones as the special cases of the present investigations. The effects of magnetic parameter, Falkner-Skan power-law parameter and the volume fraction parameter on the non-dimensional heat and mass transfer rates are presented graphically

Soret and Dufour effects on mixed convection along a vertical wavy surface in a porous medium with variable properties

AbstractThe results of mixed convective heat and mass transfer flow along a wavy surface in a Darcy porous medium are presented in the presence of cross diffusion effects. The viscosity and thermal conductivity of the fluid are assumed to be varying with respect to temperature. The governing, flow, momentum, energy and concentration equations are transformed into a set of ordinary differential equations using the similarity transformation and then solved numerically. The present results are compared with previously published work and are found to be a very good agreement. The numerical results of velocity, temperature and concentration as well as Nusselt number and Sherwood number are reported graphically for various values of variable viscosity, variable thermal conductivity, Soret number, Dufour number and amplitude of the wavy surface in two different cases, buoyancy-aiding flow and buoyancy-opposing flow

Mixed convection flow of couple stress fluid between vertical parallel plates with radiation and chemical reaction effects

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.This paper studies the effects of thermal radiation and chemical reaction on two dimensional incompressible couple stress fluid flow with mixed convective heat and mass transfer between two vertical parallel plates in a porous space. The plates are kept at different but constant temperature and concentrations. The governing non-linear partial differential equations are transformed into a system of ordinary differential equations using similarity transformations. The resulting equations are then solved using the homotopy analysis method. The effects of the radiation parameter, chemical reaction parameter and couple stress fluid parameter on velocity, temperature and concentrations are discussed and shown graphically. Also the effects of the pertinent parameters on the rates of heat and mass transfer are tabulated.cf201

MHD mixed convection in micropolar fluid with cross diffusion effects

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.This paper analyzes cross diffusion effects on the steady, mixed convection heat and mass transfer along a semi-infinite vertical plate embedded in a micropolar fluid in the presence of traverse magnetic field. The governing nonlinear partial differential equations and their associated boundary conditions are transformed into a system of coupled nonlinear ordinary differential equations using a special form of Lie group transformations, namely, the scaling group of transformations and then solved numerically using the implicit finite difference method. The non dimensional velocity, microrotation, temperature and concentration along with the non dimensional rate of heat and mass transfer at the plate are presented graphically for different values of coupling number, magnetic parameter (M), mixed convection parameter (Ri), Soret number (Sr) and Dufour number (Df). In addition, the skin-friction coefficient and the wall couple stress are shown in a tabular form.cf201

Non-similar solution for mixed convection in a porous medium saturated with nanofluid

Paper presented to the 10th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, Florida, 14-16 July 2014.This article explores the analysis of mixed convection boundary layer flow over a vertical flat plate embedded in a porous medium saturated by a nanofluid in the presence of radiation effect. The vertical plate is maintained at uniform and constant heat, mass and nanoparticle fluxes. The Darcy model is considered to describe the flow in the porous medium. The effects of Brownian motion and thermophoresis are incorporated in to the model for nanofluids. In addition, the thermal energy equations include regular diffusion and cross-diffusion terms. A suitable coordinate transformation is introduced, and the resulting system of non-similar, coupled and nonlinear partial differential equations is solved numerically by using implicit finite difference method. A comparison is made with the available results in the literature, and our results are found to be in very good agreement. The influence of pertinent parameters on the non-dimensional velocity, temperature, concentration and nanoparticle volume fraction are discussed. In addition, the variation of heat, mass and nanoparticle transfer rates at the plate are exhibited graphically for different values of physical parameters.dc201