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Laminar boundary-layer flow over a semi-infinite plate impulsively heated orcooled

Published online by Cambridge University Press:  15 September 1999

M. Rebay  and
J. Padet
M. Rebay*
Affiliation:
Laboratoire de Thermomécanique, UTAP (EA 2061), Faculté des Sciences, B.P. 1039, 51687 Reims, France
J. Padet
Affiliation:
Laboratoire de Thermomécanique, UTAP (EA 2061), Faculté des Sciences, B.P. 1039, 51687 Reims, France
*
[email protected]
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Abstract

The unsteady forced convection involved in incompressible laminarboundary-layer over a semi-infinite plate is investigated. Initially, a steady stateconvective heat transfer with constant plate temperature or constant plate heat fluxis established between the plate and the flow. By differential method, we study thethermal effect on this first state of a positive or a negative sudden change in eitherthe plate temperature or plate heat flux. Numerical solution of differential equationsis obtained for the whole transient from the initial steady state to the final one.Detailed results of the effect of the wall conditions change on the transient processare given for the fluids encountered in the usual applications (0.6 ≤ Pr ≤ 100).An exponential law of the instantaneous heat coefficient is deduced as function ofPr in the said Prandtl number range.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 7 , Issue 3 , September 1999 , pp. 263 - 269
Copyright
© EDP Sciences, 1999

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