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RESEARCH PAPERS

Variable Physical Properties in Laminar Heating of Pseudoplastic Fluids with Constant Wall Heat Flux

[+] Author and Article Information
Fabio Gori

Università di Firenze, Firenze, Italy

J. Heat Transfer 100(2), 220-223 (May 01, 1978) (4 pages) doi:10.1115/1.3450784 History: Received February 17, 1977; Online August 11, 2010

Abstract

A theoretical investigation of the combined influence of natural convection and consistency variations in laminar heating of non-Newtonian fluids has been carried out. The heating of a power law fluid with an initially fully developed velocity profile flowing upward through a vertical tube with a constant wall heat flux was considered. The system of governing equations, complete with the convective terms, was solved numerically. Detailed comparisons with previous theoretical and experimental results were performed to check the integrity of the solutions obtained with the present approach. Local heat transfer coefficients, as a function of Graetz number, were presented. Local heat transfer results showed that for pseudoplastic fluids with smaller Prandtl number the parameter Pr was very important in the inlet and in the intermediate part of the tube.

Copyright © 1978 by ASME
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