scholarly journals Jet impingement modeling of cryogen spray cooling: analysis of 2D cryogen temperature distribution

2001 ◽  
Author(s):  
Bernard Choi ◽  
Ashley J. Welch
Keyword(s):  
Temperature Distribution ◽  
Jet Impingement ◽  
Spray Cooling ◽  
Cryogen Spray Cooling

Infrared Imaging of 2-D Temperature Distribution During Cryogen Spray Cooling

2002 ◽  
Vol 124 (6) ◽  
pp. 669-675 ◽  
Author(s):  
Bernard Choi ◽  
Ashley J. Welch
Keyword(s):  
Temperature Distribution ◽  
Spray Cooling ◽  
Temperature Gradients ◽  
Measured Temperature ◽  
Back Side ◽  
Surface Cooling ◽  
Radial Temperature ◽  
Cooling Temperature ◽  
Temperature Distributions ◽  
Cryogen Spray Cooling

Cryogen spray cooling (CSC) is used in conjunction with pulsed laser irradiation for treatment of dermatologic indications. The main goal of this study was to determine the radial temperature distribution created by CSC and evaluate the importance of radial temperature gradients upon the subsequent analysis of tissue cooling throughout the skin. Since direct measurement of surface temperatures during CSC are hindered by the formation of a liquid cryogen layer, temperature distributions were estimated using a thin, black aluminum sheet. An infrared focal plane array camera was used to determine the 2-D backside temperature distribution during a cryogen spurt, which preliminary measurements have shown is a good indicator of the front-side temperature distribution. The measured temperature distribution was approximately gaussian in shape. Next, the transient temperature distributions in skin were calculated for two cases: 1) the standard 1-D solution which assumes a uniform cooling temperature distribution, and 2) a 2-D solution using a nonuniform surface cooling temperature distribution based upon the back-side infrared temperature measurements. At the end of a 100-ms cryogen spurt, calculations showed that, for the two cases, large discrepancies in temperatures at the surface and at a 60-μm depth were found at radii greater than 2.5 mm. These results suggest that it is necessary to consider radial temperature gradients during cryogen spray cooling of tissue.

scholarly journals Radial and temporal variations in surface heat transfer during cryogen spray cooling

2005 ◽  
Vol 50 (2) ◽  
pp. 387-397 ◽  
Author(s):  
Walfre Franco ◽  
Jie Liu ◽  
Guo-Xiang Wang ◽  
J Stuart Nelson ◽  
Guillermo Aguilar
Keyword(s):  
Heat Transfer ◽  
Spray Cooling ◽  
Temporal Variations ◽  
Surface Heat ◽  
Surface Heat Transfer ◽  
Cryogen Spray Cooling

scholarly journals Dynamics of cryogen deposition relative to heat extraction rate during cryogen spray cooling

2000 ◽  
Author(s):  
Wim Verkruysse ◽  
Boris Majaron ◽  
Guillermo Aguilar ◽  
Lars O. Svaasand ◽  
J. Stuart Nelson
Keyword(s):  
Spray Cooling ◽  
Extraction Rate ◽  
Heat Extraction ◽  
Cryogen Spray Cooling ◽  
Heat Extraction Rate

Treatment of Hypertrophic Scars Using a Long-Pulsed Dye Laser With Cryogen-Spray Cooling

2005 ◽  
Vol 54 (5) ◽  
pp. 487-493 ◽  
Author(s):  
Taro Kono ◽  
Ali Rza Er??????en ◽  
Hiroaki Nakazawa ◽  
Motohiro Nozaki
Keyword(s):  
Spray Cooling ◽  
Dye Laser ◽  
Pulsed Dye Laser ◽  
Hypertrophic Scars ◽  
Cryogen Spray Cooling

scholarly journals Influence of spraying distance and postcooling on cryogen spray cooling for dermatologic laser surgery

2001 ◽  
Author(s):  
Guillermo Aguilar ◽  
Boris Majaron ◽  
John A. Viator ◽  
Brooke Basinger ◽  
Emil Karapetian ◽  
...  
Keyword(s):  
Laser Surgery ◽  
Spray Cooling ◽  
Cryogen Spray Cooling
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