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RESEARCH PAPERS: Boiling Heat Transfer

Critical Heat Flux Limits for a Heated Surface Impacted by a Stream of Liquid Droplets

[+] Author and Article Information
P. J. Halvorson, R. J. Carson, S. I. Abdel-Khalik

Nuclear Engineering Program, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

S. M. Jeter

Mechanical Engineering Program, George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332

J. Heat Transfer 116(3), 679-685 (Aug 01, 1994) (7 pages) doi:10.1115/1.2910922 History: Received April 01, 1993; Revised August 01, 1993; Online May 23, 2008

Abstract

An experimental apparatus has been constructed to allow investigation of heat transfer from a horizontal, upward facing, heated surface impacted by streams of monodisperse water droplets of varying size and impact frequency. Droplet diameters between 2.3 and 3.8 mm were used, with drop frequencies varying from 2 to 15 droplets per second. The droplet impact velocity was 1.3 m/s. Critical heat flux, surface superheat, droplet size, and frequency were the primary measured data. Heat fluxes as high as 325 W/cm2 were achieved with wall superheats of only 24°C. The liquid film thickness produced upon droplet impact is shown to be a key factor in these experiments, and the importance of investigating the wetted area is highlighted. The effectiveness of droplet impact cooling using droplets with diameters on the order of millimeters is shown.

Copyright © 1994 by The American Society of Mechanical Engineers
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