Unsteady MHD mixed convection flow over an impulsively stretched permeable vertical surface in a quiescent fluid

Kumari, M. ; Nath, G. (2010) Unsteady MHD mixed convection flow over an impulsively stretched permeable vertical surface in a quiescent fluid International Journal of Non-linear Mechanics, 45 (3). pp. 310-319. ISSN 0020-7462

Full text not available from this repository.

Official URL: http://linkinghub.elsevier.com/retrieve/pii/S00207...

Related URL: http://dx.doi.org/10.1016/j.ijnonlinmec.2009.12.005

Abstract

The unsteady mixed convection flow of an incompressible laminar electrically conducting fluid over an impulsively stretched permeable vertical surface in an unbounded quiescent fluid in the presence of a transverse magnetic field has been investigated. At the same time, the surface temperature is suddenly increased from the surrounding fluid temperature or a constant heat flux is suddenly imposed on the surface. The problem is formulated in such a way that for small time it is governed by Rayleigh type of equation and for large time by Crane type of equation. The non-linear coupled parabolic partial differential equations governing the unsteady mixed convection flow under boundary layer approximations have been solved analytically by using the homotopy analysis method as well as numerically by an implicit finite difference scheme. The local skin friction coefficient and the local Nusselt number are found to decrease rapidly with time in a small time interval and they tend to steady-state values for t≥5. They also increase with the buoyancy force and suction, but decrease with injection rate. The local skin friction coefficient increases with the magnetic field, but the local Nusselt number decreases. There is a smooth transition from the unsteady state to the steady state.

Item Type:Article
Source:Copyright of this article belongs to Elsevier Science.
Keywords:Unsteady Mixed Convection; Impulsively Stretched Vertical Surface; Magnetic Field; Homotopy Analysis Method; Numerical Technique
ID Code:37463
Deposited On:18 Apr 2011 13:25
Last Modified:18 Apr 2011 13:25

Repository Staff Only: item control page