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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13596

Title: Laminar mixed convection boundary layers induced by a linearly stretching permeable surface
Authors: Ali, M .
Al-Yousef, F.
Issue Date: 2002
Citation: INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, ISI JournalVL 45, IS 21, BP 4241, EP 4250, PY 2002, TC 20
Abstract: The boundary layer flow on a linearly moving permeable vertical surface is studied when the buoyancy force assists or opposes the flow. Similarity and local similarity solutions are obtained for the boundary layer equations subject to power law temperature and velocity variation. The effect of various governing parameters, such as Prandtl number Pr, injection parameter d, and the mixed convection parameter λ = Grx/Rex2, which determine the velocity and temperature distributions, the heat transfer coefficient, and the shear stress at the surface are studied. The heat transfer coefficient increases as λ assisting the flow for all d for uniformly or linearly heated surface and as Pr increases it becomes almost independent of λ. However, as the temperature inversely proportional to the distance up the surface, the buoyancy has no effects on the heat transfer coefficient. Critical buoyancy parameter values are obtained for vanished shear stress and for predominate natural convection. Critical values are also presented for predominate buoyancy shear stress at the surface for assisting or opposing flow. A closed form analytical solution is also presented as a special case of the energy equation. (C) 2002 Published by Elsevier Science Ltd.
URI: http://hdl.handle.net/123456789/13596
ISSN: 0017-9310
Appears in Collections:College of Engineering

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