Profile Development With Mixed Convection in a High Prandtl Number Fluid

[+] Author and Article Information
P. H. G. Allen

Department of Electrical Engineering, Imperial College of Science and Technology, London, England

A. H. Finn

Elliot Brothers Ltd., London, England

J. Heat Transfer 92(2), 299-304 (May 01, 1970) (6 pages) doi:10.1115/1.3449664 History: Received March 04, 1969; Revised September 11, 1969; Online August 11, 2010


The paper deals with entry-length conditions for transformer oil in vertical laminar flow through a uniformly heated duct allowing for changes in density, viscosity, and thermal conductivity. The calculation method uses a fundamental property of high Prandtl number fluids and assumes a series of truncated temperature profiles. Calculated wall mean temperature rises have been verified experimentally for a simple case. Local and mean Nusselt numbers have been derived and an empirical correlation relating mean and limiting Nusselt numbers applied. The analysis includes evaluation of the free-convective component of pressure head which causes flow and distinguishes this from free-convective effects within the duct.

Copyright © 1970 by ASME
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