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RADIAL HEAT TRANSFER DYNAMICS DURING CRYOGEN SPRAY COOLING Walfre Franco1,3, Guo-Xiang Wang2, J. Stuart Nelson3 and Guillermo Aguilar1,3
 

Summary: RADIAL HEAT TRANSFER DYNAMICS DURING CRYOGEN SPRAY COOLING
Walfre Franco1,3, Guo-Xiang Wang2, J. Stuart Nelson3 and Guillermo Aguilar1,3
1Laboratory of Transport Phenomena for Biomedical Applications
Department of Mechanical Engineering, University of California, Riverside, CA 92521
2Department of Mechanical Engineering, University of Akron, Akron, OH 44325
3Beckman Laser Institute, University of California, Irvine, CA 92612
ABSTRACT
Cryogen spray cooling (CSC) is a heat extraction process
that protects the epidermal layer during skin laser surgery of port
wine stain (PWS) birthmarks and other specific dermatoses. The
objective of the present work is to investigate temporal and ra-
dial variations on the heat transferred at the surface of a skin
model during CSC. A fast-response thermal sensor is used to
measure temperature across the radius of the sprayed surface
of a skin model. These interior measurements along with an in-
verse heat conduction algorithm are used to determine the heat
transferred at the surface. Results show that radial and tempo-
ral variations of the boundary conditions have a strong influence
on the homogeneity of heat extraction from skin. However, there
are subregions of uniform cooling. It is also observed that the

  

Source: Aguilar, Guillermo - Department of Mechanical Engineering, University of California at Riverside

 

Collections: Engineering