Microchannel heat transfer governs the performance of the microchannel heat sink, which is a recent technology aimed at managing the stringent thermal requirements of today’s high-end electronics. The microencapsulated form of liquid crystals has been well established for use in surface temperature mapping, while limited studies are available on the use of the un-encapsulated form. This latter form is advantageous since it offers the potential for high spatial resolution, which is necessary for microgeometries. A technique for using un-encapsulated thermochromic liquid crystals (TLCs) in order to measure the local heat transfer coefficient in microchannel geometries is shown in the present study. Measurements were made in a closed loop facility combined with a microscopic imaging system and automated data acquisition. A localized TLC calibration was used to account for a non-uniform coating and variation of lighting conditions. Three test section configurations were investigated with each subsequent configuration arising due to a shortfall in the previous. Two of these configurations are comprised of single wall heated rectangular channels, while the third is a circular tube channel. Validation results are also presented; overall, the methods developed and utilized in this study have been shown to provide the local heat transfer coefficient in microchannels.
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e-mail: rmuwanga@alcor.concordia.ca
e-mail: ibrahimH@alcor.concordia.ca
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Local Heat Transfer Measurements in Microchannels Using Liquid Crystal Thermography: Methodology Development and Validation
R. Muwanga,
R. Muwanga
Department of Mechanical and Industrial Engineering,
e-mail: rmuwanga@alcor.concordia.ca
Concordia University
, 1515 St. Catherine W., Montreal, Quebec, Canada, H3G 2W1
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I. Hassan
I. Hassan
Department of Mechanical and Industrial Engineering,
e-mail: ibrahimH@alcor.concordia.ca
Concordia University
, 1515 St. Catherine W., Montreal, Quebec, Canada, H3G 2W1
Search for other works by this author on:
R. Muwanga
Department of Mechanical and Industrial Engineering,
Concordia University
, 1515 St. Catherine W., Montreal, Quebec, Canada, H3G 2W1e-mail: rmuwanga@alcor.concordia.ca
I. Hassan
Department of Mechanical and Industrial Engineering,
Concordia University
, 1515 St. Catherine W., Montreal, Quebec, Canada, H3G 2W1e-mail: ibrahimH@alcor.concordia.ca
J. Heat Transfer. Jul 2006, 128(7): 617-626 (10 pages)
Published Online: December 14, 2005
Article history
Received:
April 12, 2005
Revised:
December 14, 2005
Citation
Muwanga, R., and Hassan, I. (December 14, 2005). "Local Heat Transfer Measurements in Microchannels Using Liquid Crystal Thermography: Methodology Development and Validation." ASME. J. Heat Transfer. July 2006; 128(7): 617–626. https://doi.org/10.1115/1.2193541
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