Thermal Analysis of Droplet Spray Evaporation From a Heated Solid Surface

[+] Author and Article Information
K.-K. Tio

Department of Applied Mechanics and Engineering Sciences, University of California, San Diego, La Jolla, CA 92093-0411

S. S. Sadhal

Department of Mechanical Engineering, University of Southern California, Los Angeles, CA 90089-1453

J. Heat Transfer 114(1), 220-226 (Feb 01, 1992) (7 pages) doi:10.1115/1.2911250 History: Received January 14, 1991; Revised July 15, 1991; Online May 23, 2008


This paper deals with the heat transfer aspects of droplet spray evaporation from a heated solid surface. The analysis is restricted to the low superheat regime, in which the impinging droplets stick onto the solid without bubble nucleations. In this limit of approximation, the heat flow is quasi-steady and conduction dominated. The difficulty arising from droplet thermal interactions is overcome with an approximate model of an evaporating droplet surrounded by a uniform surface heat flux. The size of the droplet changes with time, but the effect of the surrounding droplets, which are treated as a continuum producing the uniform surface flux, is taken into consideration in an average sense. In addition, the analysis also incorporates the effects of droplet contact angle, droplet concentration, and solid conductivity. A transcendental equation has been derived and solved by using the Newton-Raphson method to obtain the Nusselt number.

Copyright © 1992 by The American Society of Mechanical Engineers
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