This paper presents experimental measurements of boiling heat transfer in a 1.067 mm inner diameter tube, using liquid crystal thermography for wall temperature measurement. The study was motivated by the two-phase microchannel pumped cooling loop, a recent technology proposed for thermal management of tomorrow's high-end electronics. The working fluid was FC-72, which is a dielectric coolant and measurements were obtained in a closed loop test facility. A unique flow boiling onset was observed whereby a large wall temperature gradient travels along the tube. During flow boiling conditions, wall temperature fluctuations have been observed. The use of a thermographic technique has added insight into the flow boiling characteristics and acts as a partial flow visualization method. Local heat transfer coefficients are presented and compared with correlations for both macro- and microchannels. The heat transfer coefficient is found to be influenced by the heat flux at a lower mass flux but only mildly at a higher mass flux.
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e-mail: ibrahimH@alcor.concordia.ca
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Technical Papers
A Flow Boiling Heat Transfer Investigation of FC-72 in a Microtube Using Liquid Crystal Thermography
R. Muwanga,
R. Muwanga
Department of Mechanical and Industrial Engineering,
Concordia University
, Montreal, Quebec H3G 1M8, Canada
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I. Hassan
I. Hassan
Department of Mechanical and Industrial Engineering,
e-mail: ibrahimH@alcor.concordia.ca
Concordia University
, Montreal, Quebec H3G 1M8, Canada
Search for other works by this author on:
R. Muwanga
Department of Mechanical and Industrial Engineering,
Concordia University
, Montreal, Quebec H3G 1M8, Canada
I. Hassan
Department of Mechanical and Industrial Engineering,
Concordia University
, Montreal, Quebec H3G 1M8, Canadae-mail: ibrahimH@alcor.concordia.ca
J. Heat Transfer. Aug 2007, 129(8): 977-987 (11 pages)
Published Online: December 6, 2006
Article history
Received:
November 1, 2005
Revised:
December 6, 2006
Citation
Muwanga, R., and Hassan, I. (December 6, 2006). "A Flow Boiling Heat Transfer Investigation of FC-72 in a Microtube Using Liquid Crystal Thermography." ASME. J. Heat Transfer. August 2007; 129(8): 977–987. https://doi.org/10.1115/1.2728905
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