Dufour Effects on Unsteady Hydromagnetic Radiative Fluid Flow past a Vertical Plate through Porous Medium

Jagdish Prakash, Avula Golla Vijaya Kumar, Desu Bhanumathi, Sibyala Vijaya Kumar Varma

Department of Mathematics, S.V. University, Tirupati, India.
Department of Mathematics, Sree Vidyanikethan Engineering College.
Department of Mathematics, University of Botswana, Gaborone, Botswana.

DOI: 10.4236/ojfd.2012.24017                

Abstract

The objective of the present study is to investigate diffusion-thermo (Dufour effect) and radiation effects on unsteady MHD free convection flow past an impulsively started infinite vertical plate with variable temperature and uniform mass diffusion in the presence of transverse applied magnetic field through porous medium. At time t > 0, the plate is given an impulsive motion with constant velocity in the vertical upward direction against to the gravitational field. At the same time the plate temperature is raised linearly with time t and the level of concentration near the plate is raised to . A magnetic field of uniform strength is applied normal to the direction to the flow. The dimen- sionless governing equations are solved in closed form by Laplace-transform technique. The effect of flow parameters on velocity, temperature, concentration, the rate of heat transfer and the rate of mass transfer are shown through graphs.

Keywords

MHD; Heat and Mass Transfer; Diffusion-Thermo (Dufour Number); Vertical Plate; Porous Medium

Conflicts of Interest

The authors declare no conflicts of interest.

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