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IEEE JOURNAL ON SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 7, NO. 6, NOVEMBER/DECEMBER 2001 1013 Measurement of Heat Flux and Heat Transfer
 

Summary: IEEE JOURNAL ON SELECTED TOPICS IN QUANTUM ELECTRONICS, VOL. 7, NO. 6, NOVEMBER/DECEMBER 2001 1013
Measurement of Heat Flux and Heat Transfer
Coefficient During Continuous Cryogen Spray
Cooling for Laser Dermatologic Surgery
Guillermo Aguilar, Wim Verkruysse, Boris Majaron, Lars O. Svaasand, Enrique J. Lavernia, and J. Stuart Nelson
Abstract--Cryogen spray cooling (CSC) has been used for
selective epidermal cooling of human skin during laser therapy
of patients with port wine stain (PWS) birthmarks. Unfortu-
nately, current commercial CSC devices do not provide optimal
cooling selectivity and, therefore, provide insufficient epidermal
protection for some PWS patients. To assist in the development of
improved atomizing nozzle designs, a reliable method to quantify
the CSC heat flux is needed. We introduce a novel method to
determine the heat flux ( ) and heat transfer coefficient ( ) at the
surface of a sprayed object, based on measurements of steady-state
temperature gradients along a thin copper rod during continuous
cryogen spraying. For an atomizing nozzle of inner diameter
= 0.7 mm, we found that varies from 15 to 130 W/cm2
and increases nonlinearly from 15 000 to 35 000 W/m2 K in
the explored range of surface temperatures ( , from 32 to

  

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

 

Collections: Engineering