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RESEARCH PAPERS

Local Heat Transfer From a Rotating Disk in an Impinging Round Jet

[+] Author and Article Information
C. O. Popiel, L. Boguslawski

Department of Working Machines and Vehicles, Technical University, 60965 Poznań, ul. Piotrowo 3, Poland

J. Heat Transfer 108(2), 357-364 (May 01, 1986) (8 pages) doi:10.1115/1.3246929 History: Received June 05, 1984; Online October 20, 2009

Abstract

The results of an experimental investigation of local convective heat transfer from the surface of a rotating disk in an impinging free round air jet, issuing from a long tube, are reported. Using a transient heat transfer method applied to the ring-shaped h-calorimeter (as a single lumped capacitance element) measurements of convective heat transfer rates were made for five impingement radius (fixed) to tube diameter ratios for a range of rotational and jet Reynolds numbers. In the pure impingement-dominated regime, where the rotation of the disk does not show an effect on heat transfer, the velocity ratio is u r /u j ≤ (1 − 2 × 10−4 Re2/3 ) (1 − 0.18 r/d), where u r = tangential velocity of the disk at the jet impingement radius r , u j = average exit velocity of jet, and d = jet tube diameter. In this regime, the local heat transfer on the rotating disk can be strongly enhanced by jet impingement. For u r /u j ⪞ 5, the effect of the jet impingement on heat transfer can be neglected. The discussion of the heat transfer results has been supported by smoke flow visualization.

Copyright © 1986 by ASME
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