The Effect of Slot Height and Slot-Turbulence Intensity on the Effectiveness of the Uniform Density, Two-Dimensional Wall Jet

[+] Author and Article Information
S. C. Kacker, J. H. Whitelaw

Department of Mechanical Engineering, Imperial College of Science and Technology, London, England

J. Heat Transfer 90(4), 469-475 (Nov 01, 1968) (7 pages) doi:10.1115/1.3597544 History: Received March 17, 1967; Revised December 19, 1967; Online August 25, 2011


This paper presents measurements of the impervious-wall effectiveness of a two-dimensional wall jet obtained using a constant value of lip thickness, 0.032 in. and four slot heights, viz., 0.5, 0.25, 0.132, and 0.074 in. The measurements are in the range of slot-to-free-stream velocity ratio

0.288 ≤ uC/uG ≤ 2.66
and clearly demonstrate that, in the region where the velocity ratio is close to unity, the effectiveness is greatly dependent upon the slot height. The reason for this dependence is investigated and additional measurements are presented to show that the influence of the slot turbulence intensity on the effectiveness is small. It is concluded that the ratio of slot lip thickness to slot height is the most significant parameter and that the effect of an increase in this ratio is to decrease the effectiveness.

Copyright © 1968 by ASME
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