On the Effect of Surface Roughness on the Vapor Flow Under Leidenfrost-Levitated Droplets

[+] Author and Article Information
M. Prat, P. Schmitz

Institut de Mecanique des Fluides de Toulouse, Avenue du Professeur Camille Soula, 31400 Toulouse, France

D. Poulikakos

Mechanical Engineering Department, University of Illinois at Chicago, 842 W. Taylor Street, Chicago, IL 60607

J. Fluids Eng 117(3), 519-525 (Sep 01, 1995) (7 pages) doi:10.1115/1.2817293 History: Received January 07, 1994; Revised October 31, 1994; Online December 04, 2007


In this paper a theoretical investigation is reported on the effect of surface roughness on the phenomenon of Leidenfrost-levitation of droplets above a hot surface. The problem is solved first approximately using a macroscopic approach in which the roughness is replaced by a semi-empirical slip condition of the Beavers-Joseph type. Next, a microscopic model which determines the vapor flow in the close vicinity of the rough surface is solved numerically. Three basic periodic roughnesses are examined: triangular, rectangular and semi-cylindrical. The effect of the relative size of the droplet and the roughness elements on the vapor flow is investigated in the course of the study.

Copyright © 1995 by The American Society of Mechanical Engineers
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