The present work is aimed toward understanding the effect of flow boiling stability on critical heat flux (CHF) with Refrigerant 123 (R-123) and water in microchannel passages. Experimental data and theoretical model to predict the CHF are the focus of this work. The experimental test section has six parallel microchannels, with each having a cross-sectional area of . The effect of flow instabilities in microchannels is investigated using flow restrictors at the inlet of each microchannel to stabilize the flow boiling process and avoid the backflow phenomena. This technique resulted in successfully stabilizing the flow boiling process. The present experimental CHF results are found to correlate best with existing correlations to overall mean absolute errors (MAEs) of 33.9% and 14.3% with R-123 and water, respectively, when using a macroscale rectangular equation by Katto (1981, “General Features of CHF of Forced Convection Boiling in Uniformly Heated Rectangular Channels,” Int. J. Heat Mass Transfer, 24, pp. 1413–1419). A theoretical analysis of flow boiling phenomena revealed that the ratio of evaporation momentum to surface tension forces is an important parameter. A theoretical CHF model is proposed using these underlying forces to represent CHF mechanism in microchannels, and its correlation agrees with the experimental data with MAE of 2.5%.
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Experimental Study and Model on Critical Heat Flux of Refrigerant-123 and Water in Microchannels
Wai Keat Kuan,
e-mail: wkuan@us.ibm.com
Wai Keat Kuan
Mem. ASME
Systems and Technology Group
, IBM Corporation, Research Triangle Park, NC 27709
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Satish G. Kandlikar
Satish G. Kandlikar
Fellow ASME
Thermal Analysis and Microfluidics Laboratory, Mechanical Engineering Department, Kate Gleason College of Engineering,
e-mail: sgkeme@rit.edu
Rochester Institute of Technology
, Rochester, NY 14623
Search for other works by this author on:
Wai Keat Kuan
Mem. ASME
Systems and Technology Group
, IBM Corporation, Research Triangle Park, NC 27709e-mail: wkuan@us.ibm.com
Satish G. Kandlikar
Fellow ASME
Thermal Analysis and Microfluidics Laboratory, Mechanical Engineering Department, Kate Gleason College of Engineering,
Rochester Institute of Technology
, Rochester, NY 14623e-mail: sgkeme@rit.edu
J. Heat Transfer. Mar 2008, 130(3): 034503 (5 pages)
Published Online: March 6, 2008
Article history
Received:
July 31, 2006
Revised:
July 22, 2007
Published:
March 6, 2008
Citation
Kuan, W. K., and Kandlikar, S. G. (March 6, 2008). "Experimental Study and Model on Critical Heat Flux of Refrigerant-123 and Water in Microchannels." ASME. J. Heat Transfer. March 2008; 130(3): 034503. https://doi.org/10.1115/1.2804936
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