Single Droplet Evaporation Model in Laser Treatment of PWS in Conjunction with Cryogen Spray Cooling

2008 ◽  
Author(s):  
Zhi-fu Zhou ◽  
Hui Xin ◽  
Bin Chen ◽  
Guo-xiang Wang
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Droplet Evaporation ◽  
Single Droplet ◽  
Evaporation Model ◽  
Cryogen Spray Cooling

Theoretical Evaporation Model of a Single Droplet in Laser Treatment of PWS in Conjunction With Cryogen Spray Cooling

2008 ◽  
Author(s):  
Zhifu Zhou ◽  
Hui Xin ◽  
Bin Chen ◽  
Guo-Xiang Wang
Keyword(s):  
Gas Phase ◽  
Laser Treatment ◽  
Deep Understanding ◽  
Theoretical Models ◽  
Spray Cooling ◽  
Droplet Evaporation ◽  
Evaporation Process ◽  
Single Droplet ◽  
Equilibrium Evaporation ◽  
Cryogen Spray Cooling

Cryogen spray is an effective cooling technique used for laser treatment of Port Wine Stain. The cooling process involves complex droplet evaporation and strong convective heat and mass transfer, therefore a deep understanding of spray characteristics is essential in order to optimize the nozzle design and improve the cooling efficiency of the spray. This paper improves a theoretical model to describe the equilibrium evaporation process of a single cryogen droplet in cryogen spray. The results of comparative analysis of gas phase models for single droplet heating and evaporation are presented. Six different semi-theoretical models based on various assumptions are compared and their effects on a single droplet heating and evaporation characteristics in the process of cryogen R-134a spray cooling are compared. It is pointed out that the gas phase model, in which the effect of superheat is taken into account, predicts the evaporation process closest to the experimental data. Finally, a parametric study of the influences of initial diameter and velocity on the droplet evaporation is then carried out. The results can be used to guide the Cryogen Spray Cooling of laser therapy.

Evaporation Characteristics of a Single Droplet in Laser Treatment of Port Wine Stain in Conjunction with Cryogen Spray Cooling

2008 ◽  
Vol 35 (6) ◽  
pp. 952-956 ◽  
Author(s):  
周致富 Zhou Zhifu ◽  
辛慧 Xin Hui ◽  
陈斌 Chen Bin ◽  
王国祥 Wang Guoxiang
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Port Wine Stain ◽  
Port Wine ◽  
Single Droplet ◽  
Cryogen Spray Cooling

Evaporation Characteristics of Single R404a Droplet in Laser Treatment of PWS in Conjunction with Cryogen Spray Cooling

2009 ◽  
Vol 36 (10) ◽  
pp. 2691-2695
Author(s):  
辛慧 Xin Hui ◽  
周致富 Zhou Zhifu ◽  
王国祥 Wang Guoxiang ◽  
陈斌 Chen Bin ◽  
王跃社 Wang Yueshe
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Cryogen Spray Cooling

scholarly journals Intermittent cryogen spray cooling for optimal heat extraction during dermatologic laser treatment

2002 ◽  
Vol 47 (18) ◽  
pp. 3275-3288 ◽  
Author(s):  
Boris Majaron ◽  
Lars O Svaasand ◽  
Guillermo Aguilar ◽  
J Stuart Nelson
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Heat Extraction ◽  
Optimal Heat ◽  
Cryogen Spray Cooling

scholarly journals Cryogen Spray Cooling and Pulsed Dye Laser Treatment of Cutaneous Hemangiomas

2001 ◽  
Vol 46 (6) ◽  
pp. 577-583 ◽  
Author(s):  
Cheng-Jen Chang ◽  
Kristen M. Kelly ◽  
J. Stuart Nelson
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Dye Laser ◽  
Pulsed Dye Laser ◽  
Cryogen Spray Cooling

Bioheat transfer analysis of cryogen spray cooling during laser treatment of port wine stains

2000 ◽  
Vol 26 (2) ◽  
pp. 145-157 ◽  
Author(s):  
T. Joshua Pfefer ◽  
Derek J. Smithies ◽  
Thomas E. Milner ◽  
Martin J.C. van Gemert ◽  
J. Stuart Nelson ◽  
...  
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Bioheat Transfer ◽  
Port Wine ◽  
Port Wine Stains ◽  
Cryogen Spray Cooling

Comparative study of cryogen spray cooling with R-134a and R-404a: implications for laser treatment of dark human skin

2006 ◽  
Vol 11 (4) ◽  
pp. 041116 ◽  
Author(s):  
Tianhong Dai ◽  
Mohammad A. Yaseen ◽  
Parmeswaran Diagaradjane ◽  
David W. Chang ◽  
Bahman Anvari
Keyword(s):  
Comparative Study ◽  
Laser Treatment ◽  
Human Skin ◽  
Spray Cooling ◽  
Cryogen Spray Cooling ◽  
R 134A

scholarly journals Cryogen Spray Cooling in Combination With Nonablative Laser Treatment of Facial Rhytides

1999 ◽  
Vol 135 (6) ◽  
Author(s):  
Kristen M. Kelly ◽  
J. Stuart Nelson ◽  
Gary P. Lask ◽  
Roy G. Geronemus ◽  
Leonard J. Bernstein
Keyword(s):  
Laser Treatment ◽  
Spray Cooling ◽  
Cryogen Spray Cooling
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