TECHNICAL PAPERS: Heat Transfer in Manufacturing

Vaporization Kinetics During Pulsed Laser Heating of Liquid Hg

[+] Author and Article Information
T. D. Bennett, M. Farrelly

Department of Mechanical and Environmental Engineering, University of California, Santa Barbara, CA 93106-5070

J. Heat Transfer 122(2), 345-350 (Oct 07, 1999) (6 pages) doi:10.1115/1.521470 History: Received March 28, 1999; Revised October 07, 1999
Copyright © 2000 by ASME
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Schematic of the major components in the TOF measurement system
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Illustration of the liquid Hg crucible used in TOF measurements
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Raw time-of-flights from liquid Hg. Distributions reflect 100-shot measurements. The five cases shown are for laser fluences of (a) 0.211, (b) 0.193, (c) 0.176, (d) 0.155, and (e) 0.135 J/cm2 .
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Energy distributions of Hg corresponding to TOF measurements in Fig. 3. The distributions reflect the experimental measurements (○) as well as Boltzmann fits (—).
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Thermal physical conditions near the liquid Hg surface at the peak of the thermal cycle (14 ns). Top panel: the temperature distribution; bottom panel: the density as a function of depth.
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Peak surface temperature as a function of pulse fluence
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Summary of measured mean translational energies versus calculated peak surface temperatures. The theoretical 2kBT relation for mean translational energy is plotted as a reference.
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Natural log of integrated TOF signal versus the reciprocal of calculated peak surface temperature. The solid lines correspond to the anticipated slope of −Δh̄lv/R̄ for a thermal mediated process, with Δh̄lv=59.1 kJ/mol for Hg.




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