This study presents, for impinging droplets and sprays, a model of the Leidenfrost point (LFP); the minimum liquid/solid interface temperature required to support film boiling on a smooth surface. The present model is an extension of a previously developed sessile drop model, based on bubble nucleation, growth, and merging criteria, as well as surface cavity size characterization [3]. The basic concept of the model is that for liquid/solid interface temperatures at and above the LFP, a sufficient number of cavities are activated and the bubble growth rates are sufficiently fast that a continuous vapor layer is established nearly instantaneously between the liquid and the solid. For impinging droplets, the influence of the rise in interfacial pressure created by the impact of the droplet with the surface, must be accounted for in determining fluid properties at the liquid-solid interface. The effect of droplet impact velocity on the LFP predicted by the model is verified for single impinging droplets, streams of droplets, as well as sprays. While the model was developed for smooth surfaces on which the roughness asperities are of the same magnitude as the cavity radii (0.1–1.0 μm), it is capable of predicting the boundary or limiting Leidenfrost temperature for rougher surfaces with good accuracy.
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A Leidenfrost Point Model for Impinging Droplets and Sprays
John D. Bernardin,
John D. Bernardin
International, Space, and Response Division, Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545
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Issam Mudawar
Issam Mudawar
Boiling and Two-phase Flow Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
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John D. Bernardin
International, Space, and Response Division, Los Alamos National Laboratory, P.O. Box 1663, MS D466, Los Alamos, NM 87545
Issam Mudawar
Boiling and Two-phase Flow Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division April 9, 2003; revision received December 4, 2003. Associate Editor: R. M. Manglik.
J. Heat Transfer. Apr 2004, 126(2): 272-278 (7 pages)
Published Online: May 4, 2004
Article history
Received:
April 9, 2003
Revised:
December 4, 2003
Online:
May 4, 2004
Citation
Bernardin, J. D., and Mudawar, I. (May 4, 2004). "A Leidenfrost Point Model for Impinging Droplets and Sprays ." ASME. J. Heat Transfer. April 2004; 126(2): 272–278. https://doi.org/10.1115/1.1652045
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