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IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 50, NO. 7, JULY 2003 863 Experimental Study of Cryogen Spray Properties for
 

Summary: IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, VOL. 50, NO. 7, JULY 2003 863
Experimental Study of Cryogen Spray Properties for
Application in Dermatologic Laser Surgery
Guillermo Aguilar*, Boris Majaron, Emil Karapetian, Enrique J. Lavernia, and J. Stuart Nelson
Abstract--Cryogenic sprays are used for cooling human skin
during laser dermatologic surgery. In this paper, six straight-tube
nozzles are characterized by photographs of cryogenic spray
shapes, as well as measurements of average droplet diameter,
velocity, and temperature. A single-droplet evaporation model
to predict average spray droplet diameter and temperature is
tested using the experimental data presented here. The results
show two distinct spray patterns--sprays for 1.4-mm-diameter
nozzles (wide nozzles) show significantly larger average droplet
diameters and higher temperatures as a function of distance
from the nozzle compared with those for 0.50.8-mm-diameter
nozzles (narrow nozzles). These results complement and support
previously reported studies, indicating that wide nozzles induce
more efficient heat extraction than the narrow nozzles.
Index Terms--Droplet size, nozzle geometry, skin cooling.
I. INTRODUCTION

  

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

 

Collections: Engineering