RESEARCH PAPERS: Forced Convection

Second Law Analysis of Laminar Viscous Flow Through a Duct Subjected to Constant Wall Temperature

[+] Author and Article Information
A. Z. Şahin

Department of Mechanical Engineering, King Fahd University of Petroleum and Minerals, P.O. Box 1461, Dhahran 31261, Saudi Arabia

J. Heat Transfer 120(1), 76-83 (Feb 01, 1998) (8 pages) doi:10.1115/1.2830068 History: Received March 19, 1996; Revised October 31, 1997; Online January 07, 2008


Entropy generation for a fully developed laminar viscous flow in a duct subjected to constant wall temperature is investigated analytically. The temperature dependence on the viscosity is taken into consideration in the analysis. The ratio of the pumping power to the total heat flux decreases considerably and the entropy generation increases along the duct length for viscous fluids. The variation of total exergy loss due to both the entropy generation and the pumping process is studied along the duct length as well as varying the fluid inlet temperature for fixed duct length. For low heat transfer conditions the entropy generation due to viscous friction becomes dominant and the dependence of viscosity with the temperature becomes essentially important to be considered in order to determine the entropy generation accurately.

Copyright © 1998 by The American Society of Mechanical Engineers
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