Bubble behavior during saturated FC-72 spray cooling was experimentally investigated. A heater previously used for pool boiling was used to allow direct comparison. The results are analyzed to reveal the interaction between bubbles and impinging droplets. The following are presented: (1) the importance of secondary nuclei entrained by impingement droplets, (2) the role of impinging droplets on bubble parameters such as growth, diameter at puncture, lifetime, life cycle and bubble number density, and (3) the relative contribution of nucleation, especially that of secondary nuclei, to the heat transfer. It is concluded that increasing the droplet flux increases the number of secondary nuclei, helps to lower surface temperature for a given heat flux, increases the overall heat transfer coefficient, and increases heat transfer due to both nucleate boiling and enhanced convection. Increasing the droplet flux also shortens the bubble growth time (i.e., resulting in earlier bubble removal) and life cycle. However, increasing the droplet flux (and, therefore, secondary nucleation) for each of the three heat flux values does not affect the percentage of either nucleate or convection heat transfer. This suggests that both the nucleate and convection heat transfer are enhanced, as a result of increased secondary nuclei and turbulent mixing due to the impinging droplets.
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Technical Papers
Bubble Behavior and Nucleate Boiling Heat Transfer in Saturated FC-72 Spray Cooling
Daniel P. Rini,
Daniel P. Rini
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
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Ruey-Hung Chen,
e-mail: chenrh@pegasus.cc.ucf.edu
Ruey-Hung Chen
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
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Louis C. Chow
Louis C. Chow
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
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Daniel P. Rini
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
Ruey-Hung Chen
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
e-mail: chenrh@pegasus.cc.ucf.edu
Louis C. Chow
Department of Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, FL 32816-2450
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division November 1, 2000; revision received June 5, 2001. Associate Editor: T. Avedisian.
J. Heat Transfer. Feb 2002, 124(1): 63-72 (10 pages)
Published Online: June 5, 2001
Article history
Received:
November 1, 2000
Revised:
June 5, 2001
Citation
Rini , D. P., Chen, R., and Chow, L. C. (June 5, 2001). "Bubble Behavior and Nucleate Boiling Heat Transfer in Saturated FC-72 Spray Cooling ." ASME. J. Heat Transfer. February 2002; 124(1): 63–72. https://doi.org/10.1115/1.1418365
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