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Axial wall conduction preheating effects in high Péclet number laminar forced convection

✍ Scribed by Stefano Piva

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
695 KB
Volume
39
Category
Article
ISSN
0017-9310

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✦ Synopsis

An analytical solution for the preheating due to the wail axial conduction in forced convection heating of fully developed laminar flows, is presented. The geometry of interest consists of a long circular tube heated for a finite or semi-infinite length. It is proved that in the preheating region the wall heat flux varies with exponential law in the streamwise direction, so that the temperature protile becomes fully developed. Moreover, an exact functional relation between the exponent of the wall heat flux distribution and a single parameter, which depends on the Pkclet number and the wall conductance, is derived. The practical significance of the analysis is finally discussed.

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✍ W.Sam Wong; D.Andrew S. Rees; Ioan Pop 📂 Article 📅 2004 🏛 Elsevier Science 🌐 French ⚖ 371 KB

We study the forced convective heat transfer from a uniform temperature cylinder placed perpendicular to an otherwise uniform fluid stream in a porous medium at finite values of the Péclet number. Attention is focused on how the absence of local thermal equilibrium between the solid and fluid phases