Forced Laminar Convection in a Curved Isothermal Square Duct

[+] Author and Article Information
G. J. Hwang, Chung-Hsing Chao

Department of Power Mechanical Engineering, National Tsing Hua University, Hsinchu, Taiwan, 30043

J. Heat Transfer 113(1), 48-55 (Feb 01, 1991) (8 pages) doi:10.1115/1.2910550 History: Received July 10, 1989; Revised May 18, 1990; Online May 23, 2008


A numerical study is made to investigate the forced laminar convection in the hydrodynamically and thermally fully developed region of a curved isothermal square duct. Solutions with one and two pairs of vortices superimposed on the main flow are obtained. In the thermally fully developed region, a three-dimensional energy equation of elliptic type is reduced to a two-dimensional one with an eigenvalue, and the axial diffusion term is considered for a small value of the Peclet number. Flow characteristics for cases of dimensionless radius of curvature β = ∞, 50, 10, and 5 with the square of the Dean number ranging from 0 to 106 in a square duct are studied. In addition, heat transfer characteristics for large dimensionless radii of curvature, Pr=0.7 and 7.0, and Peclet number Pe=∞, 10, 5, and 1 are also examined.

Copyright © 1991 by The American Society of Mechanical Engineers
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