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RESEARCH PAPERS: Heat Conduction in Thin Films

Experimental Study on Convective Heat Transfer for Turbulent Flow in a Square Duct With a Ribbed Rough Wall (Characteristics of Mean Temperature Field)

[+] Author and Article Information
M. Hirota, H. Fujita

Department of Mechanical Engineering, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-01, Japan

H. Yokosawa

School of Informatics and Sciences, Nagoya University, Furocho, Chikusa-ku, Nagoya 464-01, Japan

J. Heat Transfer 116(2), 332-340 (May 01, 1994) (9 pages) doi:10.1115/1.2911405 History: Received October 01, 1992; Revised July 01, 1993; Online May 23, 2008

Abstract

This paper presents experimental results concerning a time-mean temperature field obtained in forced convection heat transfer for a turbulent flow through a square duct with a ribbed rough bottom wall. The secondary flow pattern in the duct is reflected in the distribution of the local Nusselt number, the values of which on the smooth walls of the rough duct are 1.71~1.97 times those of the smooth duct. In the upper half cross section near the upper smooth wall opposite the bottom ribbed rough wall, the profile of the mean temperature distribution is similar to that of the primary flow velocity distribution, and the validity of the temperature inner law was confirmed. However, in the lower half cross section near the bottom ribbed rough wall, the dissimilarity between the mean velocity and the mean temperature fields becomes pronounced, and the inner law is not valid for mean temperature distributions. The mechanism of the heat transfer near the ribbed rough wall was examined based on the transport equations of turbulent shear stress and turbulent heat flux.

Copyright © 1994 by The American Society of Mechanical Engineers
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