Local Heat/Mass Transfer Distributions on the Surface of a Wall-Mounted Cube

[+] Author and Article Information
M. K. Chyu, V. Natarajan

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213

J. Heat Transfer 113(4), 851-857 (Nov 01, 1991) (7 pages) doi:10.1115/1.2911213 History: Received October 05, 1990; Revised February 19, 1991; Online May 23, 2008


Local mass transfer from the surface of a wall-mounted cube is studied using the naphthalene sublimation technique. The streakline pattern on each face of the cube is visualized using the oil-graphite method. A horseshoe vortex system near the endwall, in conjunction with the separated shear layers initiated at sharp edges, determines the transport characteristics around the cube. As a direct influence of the flow field, the local mass transfer distributions reflect features of three-dimensional flow separation that are significantly different from their two-dimensional counterparts existing in the midsection of a long prism. According to several previous studies, average mass transfer over the rear surface of a square prism without end effects is the highest among all surfaces. However, it is the lowest for the present case with a wall-mounted cube. The cube side wall has the highest average mass transfer overall. This is a result of the elevated local mass transfer existing in the lower portion of the surface, near which a horseshoe vortex system prevails. In addition to local data, correlations of average Sherwood number with Reynolds number are also presented for various surfaces.

Copyright © 1991 by The American Society of Mechanical Engineers
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