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RESEARCH PAPERS: Porous Media, Particles, and Droplets

Heat Transfer of Sprays of Large Water Drops Impacting on High Temperature Surfaces

[+] Author and Article Information
T. L. Cox

Alcoa Technical Center, 100 Technical Drive, Alcoa Center, PA 15069

S. C. Yao

Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213-3890

J. Heat Transfer 121(2), 446-450 (May 01, 1999) (5 pages) doi:10.1115/1.2825998 History: Received March 02, 1998; Revised December 21, 1998; Online December 05, 2007

Abstract

Experiments were performed to evaluate the heat transfer of monodisperse sprays of large droplet diameters, ranging from 3 to 25 mm, on high temperature surfaces. This range of drop sizes has not previously been studied, and it was of interest to determine their heat transfer characteristics and how they relate to sprays of smaller drops. Parametric tests showed that the spray heat flux depends on mass flux with a power-law relationship, and that spray effectiveness, which relates the actual spray heat transfer to the maximum heat transfer potential, varies with d−1/2 . There was no discernible relationship between the heat transfer and droplet velocity. These results agreed favorably with published results for smaller droplets. The current data was compared to previous tests with smaller droplets using the droplet Reynolds and Weber numbers. This analysis showed some grouping, with a marked separation at We = 80, where the dynamic behavior of droplets has been shown to change for nonwetting impaction.

Copyright © 1999 by The American Society of Mechanical Engineers
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