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

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

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Official URL: http://dx.doi.org/10.1016/j.ijnonlinmec.2009.12.00...


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. (C) 2010 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier Science.
Keywords: Unsteady mixed convection; Impulsively stretched vertical surface; Magnetic field; Homotopy analysis method; Numerical technique
Department/Centre: Division of Physical & Mathematical Sciences > Mathematics
Depositing User: Ms G Yashodha
Date Deposited: 10 Jun 2010 04:46
Last Modified: 19 Sep 2010 05:59
URI: http://eprints.iisc.ac.in/id/eprint/27034

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