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Numerical analysis of cryogen spray cooling of skin in dermatologic laser surgery using realistic boundary conditions.

Author(s) : LI D., HE Y., LIU Y., et al.

Summary

Laser dermatologic surgery is widely used for various skin problems. To prevent any unwanted damage of skins due to melanin absorption in the epidermis, cryogen spray cooling, CCSC, is developed by spraying a cryogen on the surface prior to the laser implement. Several numerical analyses have been performed to investigate quantitatively the cooling effect of epidermis during CSC. Most of these studies have applied the Newton's law of cooling on the cooling surface with a constant convective heat transfer coefficient throughout the entire spray cooling process. Recent experimental works, however, demonstrate that the value of h may change significantly during CSC and is a strong function of both time and location. Based on the experimental measurements, this paper presents a generalized correlation for the normalized heat transfer coefficient as a function of the normalized time and space. The correlation is then introduced into a two-dimensional axisymmetric model of cryogen spray cooling in laser dermatological surgery of port wine stain. The model calculations demonstrated that the present correlation can correctly reflect the temporal and spatial characteristics of cryogen spray cooling and can be used for quantitative predictions of cryogen spray cooling of any laser dermatological processes.

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Pages: ICR07-C1-1371

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Details

  • Original title: Numerical analysis of cryogen spray cooling of skin in dermatologic laser surgery using realistic boundary conditions.
  • Record ID : 2007-2831
  • Languages: English
  • Source: ICR 2007. Refrigeration Creates the Future. Proceedings of the 22nd IIR International Congress of Refrigeration.
  • Publication date: 2007/08/21

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