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RESEARCH PAPERS: Evaporation

Leidenfrost Evaporation of Liquid Nitrogen Droplets

[+] Author and Article Information
S. Chandra, S. D. Aziz

Department of Mechanical Engineering, University of Toronto, Toronto, Ontario M5S 1A4 Canada

J. Heat Transfer 116(4), 999-1006 (Nov 01, 1994) (8 pages) doi:10.1115/1.2911477 History: Received April 01, 1993; Revised October 01, 1993; Online May 23, 2008

Abstract

The evaporation of a single droplet of liquid nitrogen, levitated during film boiling above a solid, impervious surface, was studied experimentally. The droplet initial diameter (1.9 mm), surface temperature (~20°C), ambient temperature (~20°C), and ambient pressure (~0.1 MPa) were held constant. The principal parameters varied were the surface material (copper or glass), and roughness (0.35 to 50 μm). Measurements were made of the droplet diameter evolution and the surface temperature variation during droplet impact. Predictions from existing models of droplets in Leidenfrost evaporation agree well with measurements of the droplet evaporation rate. The droplet lifetime was found to be slightly longer on the glass surface than it was on the copper surface, corresponding to the greater cooling of the glass surface during droplet impact. The droplet evaporation rate was unchanged by small increases in surface roughness. However, ridges on the surface with a height of the same magnitude as the thickness of the vapor film under the drop caused vapor bubble nucleation in the droplet, and significantly reduced the droplet evaporation time.

Copyright © 1994 by The American Society of Mechanical Engineers
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