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RESEARCH PAPERS

Heat Transfer by a Square Array of Round Air Jets Impinging Perpendicular to a Flat Surface Including the Effect of Spent Air

[+] Author and Article Information
D. M. Kercher

Turbine Aerodynamics and Cooling, Design Technology Operation, Aircraft Engine Group, General Electric Company, Cincinnati, Ohio

W. Tabakoff

Department of Aerospace Engineering, University of Cincinnati, Cincinnati, Ohio

J. Eng. Power 92(1), 73-82 (Jan 01, 1970) (10 pages) doi:10.1115/1.3445306 History: Received December 17, 1968; Online July 14, 2010

Abstract

The results of an experimental investigation on the average surface heat transfer co-efficients under a perforated plate of multiple, square array, round impinging air jets are presented. Correlation of the heat transfer performance in a semi-enclosed environment is presented. The correlation includes the effects of the jet “spent air” flowing perpendicular to the jets; the effects of the jet diameter, jet spacing, and jet-to-surface distance. The data cover a range of jet diameter Reynolds number from 3 × 102 to 3 × 104 , jet spacing from 3.1 to 12.5 dia, and plate-to-surface distance of 1.0 to 4.8 dia. The results are compared with previously reported investigations with reasonable agreement. Correlation is in the form NuD,x = φ1 φ2 ReD m (Zn /D)0.091 Pr1/3 where φ1 and m are functions of the jet spacing parameter, Xn /D, and Reynolds number, and φ2 is the heat transfer coefficient degradation factor due to “spent air”. φ1 , φ2 and m are presented in graphical form as a function of important dimensionless parameters.

Copyright © 1970 by ASME
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