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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/13229

Title: Convection regimes and heat transfer characteristics along a continuously moving heated vertical plate
Authors: Al-Sanea, S.A.,
Keywords: Backward boundary layer; Continuously moving surface; Laminar convection regimes; Mixed convection
Issue Date: 2003
Publisher: Elsevier
Citation: International Journal of Heat and Fluid Flow Volume 24, Issue 6, December 2003, Pages 888-901
Abstract: The steady laminar flow and thermal characteristics of a continuously moving vertical sheet of extruded material are studied close to and far downstream from the extrusion slot. The velocity and temperature variations, obtained by a finite volume method, are used to map out the entire forced, mixed and natural convection regimes. The effects of the Prandtl number (Pr) and the buoyancy force parameter (B) on the friction and heat transfer coefficients are investigated. Comparisons with experimental measurements and solutions by others in the pure forced and pure natural convection regions are made. In the mixed convection region, the results are compared with available finite-difference solutions of the boundary layer equations showing excellent agreement. The region close to the extrusion slot is characterized as a non-similar forced-convection dominated region in which NuxRe-1/2x drops sharply with increasing Richardson number (Rix). This is followed by a self-similar forced-convection dominated region in which NuxRe-1/2x levels off with increasing Rix until the buoyancy effect sets in. The existence and extent of the latter region depend upon the value of B. A non-similar mixed convection region where increasing buoyancy effect enhances the heat transfer rate follows. Finally, this region is followed downstream by a self-similar natural-convection dominated region in which NuxRe-1/2x approaches the pure natural convection asymptote at large Rix. Critical values of Rix to distinguish the various convection regimes are determined for different Pr and B.
URI: http://hdl.handle.net/123456789/13229
ISSN: 00179310
Appears in Collections:College of Engineering

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