Unsteady mixed convection over two-dimensional and axisymmetric bodies

Devi, Surma CD and Nath, G (1988) Unsteady mixed convection over two-dimensional and axisymmetric bodies. In: Warme und Stoffubertragung-Thermo & Fluid Dynamics, 22 (1-2). pp. 83-90.

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Abstract

The unsteady laminar incompressible mixed convection flow over a two-dimensional body (cylinder) and an axisymmetric body (sphere) has been studied when the buboyancy forces arise from both thermal and mass diffusion and the unsteadiness in the flow field is introduced by the time dependent free stream velocity. The nonlinear partial differential equations with three independent variables governing the flow have been solved numerically using an implicit finite-difference scheme in combination with the quasilinearization technique. The results indicate that for the thermally assisting flow the local skin friction, heat transfer and mass diffusion are enhanced when the buoyancy force from mass diffusion assists the thermal buoyancy force. But this trend is opposite for the thermally opposing flow. The point of zero skin friction moves upstream due to unsteadiness. No singularity is observed at the point of zero skin friction for unsteady flow unlike steady flow. The flow reversal is observed after a certain instant of time. The velocity overshoot occurs for assisting flows.

Item Type:	Journal Article
Publication:	Warme und Stoffubertragung-Thermo & Fluid Dynamics
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Department/Centre:	Division of Physical & Mathematical Sciences > Mathematics
Date Deposited:	13 Oct 2010 09:19
Last Modified:	13 Oct 2010 09:19
URI:	http://eprints.iisc.ac.in/id/eprint/33066

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