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Proceedings Paper

Sequential cryogen spraying for heat flux control at the skin surface
Author(s): Boris Majaron; Guillermo Aguilar; Brooke Basinger; Lise Lyngsnes Randeberg; Lars Othar Svaasand; Enrique J. Lavernia; J. Stuart Nelson
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Paper Abstract

Heat transfer rate at the skin-air interface is of critical importance for the benefits of cryogen spray cooling in combination with laser therapy of shallow subsurface skin lesions, such as port-wine stain birthmarks. With some cryogen spray devices, a layer of liquid cryogen builds up on the skin surface during the spurt, which may impair heat transfer across the skin surface due to relatively low thermal conductivity and potentially higher temperature of the liquid cryogen layer as compared to the spray droplets. While the mass flux of cryogen delivery can be adjusted by varying the atomizing nozzle geometry, this may strongly affect other spray properties, such as lateral spread (cone), droplet size, velocity, and temperature distribution. We present here first experiments with sequential cryogen spraying, which may enable accurate mass flux control through variation of spray duty cycle, while minimally affecting other spray characteristics. The observed increase of cooling rate and efficiency at moderate duty cycle levels supports the above described hypothesis of isolating liquid layer, and demonstrates a novel approach to optimization of cryogen spray devices for individual laser dermatological applications.

Paper Details

Date Published: 21 May 2001
PDF: 8 pages
Proc. SPIE 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI, (21 May 2001); doi: 10.1117/12.427777
Show Author Affiliations
Boris Majaron, Beckman Laser Institute and Medical Clinic and Jozef Stefan Institute (Slovenia)
Guillermo Aguilar, Beckman Laser Institute and Medical Clinic and Whitiker Ctr. for Biomedical Engineering (United States)
Brooke Basinger, Beckman Laer Institute and Medical Clinic (United States)
Lise Lyngsnes Randeberg, Norwegian Univ. of Science and Technology (Norway)
Lars Othar Svaasand, Norwegian Univ. of Science and Technology (Norway)
Enrique J. Lavernia, Univ. of California/Irvine (United States)
J. Stuart Nelson, Beckman Laser Institute and Medical Clinic and Whitaker Ctr. for Biomedical Engineering (United States)

Published in SPIE Proceedings Vol. 4244:
Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI
Lawrence S. Bass; David S. Robinson; Eugene A. Trowers; Kenton W. Gregory; Lou Reinisch; Kenneth Eugene Bartels; R. Rox Anderson; Reza S. Malek; Kenneth Eugene Bartels; Lloyd P. Tate; Abraham Katzir; C. Gaelyn Garrett; Timothy A. Woodward; Hans-Dieter Reidenbach; George M. Peavy; Lawrence S. Bass; C. Gaelyn Garrett; Michael D. Lucroy; Kenton W. Gregory; Abraham Katzir; Nikiforos Kollias; Michael D. Lucroy; Reza S. Malek; J. Stuart Nelson; George M. Peavy; Hans-Dieter Reidenbach; Lou Reinisch; David S. Robinson; Lloyd P. Tate; Eugene A. Trowers; Timothy A. Woodward, Editor(s)

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