RESEARCH PAPERS: Forced Convection

Effects of Temperature-Dependent Viscosity Variations and Boundary Conditions on Fully Developed Laminar Forced Convection in a Semicircular Duct

[+] Author and Article Information
T. M. Harms, M. A. Jog, R. M. Manglik

Department of Mechanical, Industrial, and Nuclear Engineering, University of Cincinnati, Cincinnati, OH 45221-0072

J. Heat Transfer 120(3), 600-605 (Aug 01, 1998) (6 pages) doi:10.1115/1.2824317 History: Received March 10, 1997; Revised March 03, 1998; Online December 05, 2007


Fully developed laminar flows in a semicircular duct with temperature-dependent viscosity variations in the flow cross section are analyzed, where the viscosity-temperature behavior is described by the Arrhenius model. Both the T and H1 boundary conditions are considered, as they represent the most fundamental heating/cooling conditions encountered in practical compact heat exchanger applications. Numerical solutions for the flow velocity and the temperature fields have been obtained by finite difference technique. The friction factor and Nusselt number results display a strong dependence on the viscosity ratio (μw /μb ), and this is correlated using the classical power-law relationship. However, results indicate that the power-law exponents are significantly different from traditional values for circular tube. They are found to be functions of the flow geometry, boundary condition, and direction of heat transfer (heating or cooling).

Copyright © 1998 by The American Society of Mechanical Engineers
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