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Enhancement of Pool Boiling Heat Transfer and Control of Bubble Motion in Microgravity Using Electric Fields - BCOELThe BCOEL project focuses on improving pool boiling heat transfer and bubble control in microgravity by exposing the fluid to electric fields. The electric fields induce a body force that can replace gravity in the low gravity environment, and enhance bubble removal from thc heated surface. A better understanding of microgravity effects on boiling with and without electric fields is critical to the proper design of the phase-change-heat-removal equipment for use in space-based applications. The microgravity experiments will focus on the visualization of bubble formation and shape during boiling. Heat fluxes on the boiling surface will be measured, and, together with the measured driving temperature differences, used to plot boiling curvcs for different electric field magnitudes. Bubble formation and boiling processes were found to be extremely sensitive to g-jitter. The duration of the experimental run is critical in order to achieve steady state in microgravity experiments. The International Space Station provides conditions suitable for such experiments. The experimental appararus to be used in the study is described in the paper. The apparatus will be tested in the KC-135 first, and microgravity experiments will be conducted on board of the International Space Station using the Microgravity Science Glovebox as the experimental platform.
Document ID
20110001185
Acquisition Source
Glenn Research Center
Document Type
Conference Paper
Authors
Herman, Cila
(Johns Hopkins Univ. Baltimore, MD, United States)
Iacona, Estelle
(Johns Hopkins Univ. Baltimore, MD, United States)
Acquaviva, Tom
(NASA Glenn Research Center Cleveland, OH, United States)
Coho, Bill
(NASA Glenn Research Center Cleveland, OH, United States)
Grant, Nechelle
(NASA Glenn Research Center Cleveland, OH, United States)
Nahra, Henry
(NASA Glenn Research Center Cleveland, OH, United States)
Sankaran, Subramanian
(NASA Glenn Research Center Cleveland, OH, United States)
Taylor, Al
(NASA Glenn Research Center Cleveland, OH, United States)
Julian, Ed
(ZIN Technologies, Inc. Cleveland, OH, United States)
Robinson, Dale
(ZIN Technologies, Inc. Cleveland, OH, United States)
VanZandt, Dave
(ZIN Technologies, Inc. Cleveland, OH, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2001
Subject Category
Fluid Mechanics And Thermodynamics
Report/Patent Number
AIAA Paper 2001-5115
Funding Number(s)
CONTRACT_GRANT: NAG3-1815
Distribution Limits
Public
Copyright
Other

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