RESEARCH PAPERS: Forced Convection

Local Friction and Heat Transfer Behavior of Water in a Turbulent Pipe Flow With a Large Heat Flux at the Wall

[+] Author and Article Information
E. Choi, Y. I. Cho

Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, PA 19104

J. Heat Transfer 117(2), 283-288 (May 01, 1995) (6 pages) doi:10.1115/1.2822518 History: Received July 01, 1993; Revised July 01, 1994; Online December 05, 2007


The present study investigated the behavior of friction and heat transfer coefficients of water flowing turbulently in a relatively long (i.e., 950 diameter long) circular pipe. When a large heat flux was applied at the wall, the viscosity of water significantly decreased along the axial direction due to the increasing temperature of water. A concept of a “redeveloping region” was introduced, where the local heat transfer coefficient increased while the local friction coefficient decreased due to the above-mentioned viscosity change. The present study proposed the use of local bulk-mean temperature to determine local Nusselt numbers by using local Reynolds (ReLB ) and Prandtl numbers (PrLB ), a method that automatically took into account the effect of axial viscosity change on the evaluation of local heat transfer coefficients. A new turbulent heat transfer correlation for the prediction of the local Nusselt number is given as Nux = 0.00425 ReLB0.979 PrLB0.4wb)−0.11.

Copyright © 1995 by The American Society of Mechanical Engineers
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