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RESEARCH PAPERS

Convective Heat Transfer by Impingement of Circular Liquid Jets

[+] Author and Article Information
X. Liu, J. H. Lienhard, J. S. Lombara

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

J. Heat Transfer 113(3), 571-582 (Aug 01, 1991) (12 pages) doi:10.1115/1.2910604 History: Received July 04, 1990; Revised September 29, 1990; Online May 23, 2008

Abstract

The impingement of circular, liquid jets provides a convenient method of cooling surfaces. Here, jet impingement cooling of uniformly heated surfaces is investigated analytically and experimentally for stable, unsubmerged, uniform velocity laminar jets in the absence of phase change. Analytical and numerical predictions are developed for a laminar radial film flow. Experiments using undisturbed laminar jets were performed to determine local Nusselt numbers from the stagnation point to radii of up to 40 diameters. Turbulent transition in the film flow is observed experimentally at a certain radius. Beyond this transition radius, a separate turbulent analysis is constructed. Integral method results are compared to numerical results, and Prandtl number effects are investigated. The predictions are found to agree well with the measurements for both laminar and turbulent flow. Predictive formulae are recommended for the entire range of radii.

Copyright © 1991 by The American Society of Mechanical Engineers
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