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TECHNICAL PAPERS: Bubbles, Particles, and Droplets

A Leidenfrost Point Model for Impinging Droplets and Sprays

[+] Author and Article Information
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

J. Heat Transfer 126(2), 272-278 (May 04, 2004) (7 pages) doi:10.1115/1.1652045 History: Received April 09, 2003; Revised December 04, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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References

Figures

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Typical temperature-time history of a surface during spray quenching
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Transient cavity nucleation model including (a) cavity nucleation superheat criteria and corresponding cavity size distribution with transient activation window, and (b) transient maximum and minimum active cavity radii for water in contact with a hot surface with an interface temperature of 165°C 3
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Temperature dependence of the (a) transient vapor layer coverage and (b) average vapor layer growth rate for a sessile water droplet on a polished aluminum surface 3
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(a) Velocity and temperature dependence of the average vapor layer growth rate for water droplets impinging upon a polished aluminum surface, and (b) comparison of the velocity dependent LFP model for water droplets impinging upon a polished surface, using different impact pressure sub-models, with experimental data. The uncertainties of experimental Leidenfrost temperatures and droplet impact velocities measured in studies 823242526 were reported not to exceed ±10°C and ±0.5 m/s, respectively.
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Effect of surface roughness on the LFP for water droplets impinging upon metallic surfaces as determined experimentally and compared with the LFP model for a polished aluminum surface. The uncertainties of experimental Leidenfrost temperatures and droplet impact velocities measured in studies 82425 were reported not to exceed ±10°C and ±0.5 m/s, respectively.

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