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

Bernard Choi; Ashley J. Welch

doi:10.1117/12.427836

21 May 2001 Jet impingement modeling of cryogen spray cooling: analysis of 2D cryogen temperature distribution

Bernard Choi, Ashley J. Welch

Proceedings Volume 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI; (2001) https://doi.org/10.1117/12.427836
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States

Abstract

The main goal of this study was to demonstrate the feasibility of using backside infrared imaging to estimate the spatial cryogen temperature distribution during a cryogen spurt. Calculations from numerical models showed that the frontside temperature distribution could be identified at the back side of a thin aluminum sheet. Infrared images were obtained at various timepoints during a cryogen spurt from the back side of an 800-micrometers aluminum sheet and the temperature distribution estimated. The temperature distribution was approximately gaussian in shape. A secondary goal was to calculate the temperature distribution in skin for two cases: 1) uniform cryogen temperature distribution, essentially representative of a 1D geometry assumption; and 2) nonuniform distribution. At the end of a 100-ms spurt, calculations showed that, for the two cases, large discrepancies in temperatures at the surface and at a 60-micrometers depth were found at radii greater than 2.5 mm. These results suggest that it is necessary to consider spatial cryogen temperature gradients during cryogen spray cooling of tissue.

Citation Download Citation

Bernard Choi and Ashley J. Welch "Jet impingement modeling of cryogen spray cooling: analysis of 2D cryogen temperature distribution", Proc. SPIE 4244, Lasers in Surgery: Advanced Characterization, Therapeutics, and Systems XI, (21 May 2001); https://doi.org/10.1117/12.427836

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