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Effects of Noncondensable Gas and Subcooling on the Spray Cooling of an Isothermal Surface

[+] Author Affiliations
Bohumil Horacek, Jungho Kim, Kenneth T. Kiger

University of Maryland, College Park, MD

Paper No. IMECE2003-41680, pp. 69-77; 9 pages
doi:10.1115/IMECE2003-41680
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Spatially resolved heat transfer measurements have been made on a nominally isothermal surface that is spray cooled. The effects of dissolved gas and subcooling were studied. The local measurements were obtained using a microheater array with ninety-six heaters each about 700 microns in size. The heater array consisted of thin-film platinum resistors deposited on a quartz substrate. Electronic feedback circuits were used to keep each of the heaters at a constant temperature and the voltage required to do this was measured. The array was cooled with FC-72 using a spray nozzle from ISR. The heat transfer data was correlated with high-speed images of the flow structure obtained from below. In this paper, heat transfer mechanisms in spray cooling will be discussed, with a particular emphasis on the effects of a non-condensable gas on critical heat flux in comparison to the comparable effects of thermally subcooling the liquid prior to atomization.

Copyright © 2003 by ASME
Topics: Cooling , Sprays , Subcooling

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