Recent experimental studies of evaporation in microchannels have shown that local flow-boiling coefficients are almost independent of vapor quality, weakly dependent on mass flux, moderately dependent on evaporating pressure, and strongly dependent on heat flux. In a conventional (macrochannel) geometry, such trends suggest nucleate boiling as the dominant heat transfer mechanism. In this paper, we put forward a simple new heat transfer model based on the hypothesis that thin-film evaporation into elongated bubbles is the important heat transfer mechanism in these flows. The new model predicts the above trends and quantitatively predicts flow-boiling coefficients for experimental data with several fluids. The success of this new model supports the idea that thin-film evaporation into elongated bubbles is the important heat transfer mechanism in microchannel evaporation. The model provides a new tool for the study of such flows, assists in understanding the heat transfer behavior, and provides a framework for predicting heat transfer.
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Heat Transfer Model for Evaporation of Elongated Bubble Flows in Microchannels
Anthony M. Jacobi, Professor of Mechanical Engineering,,
Anthony M. Jacobi, Professor of Mechanical Engineering,
Department of Mechanical Engineering, University of Illinois, Urbana, IL, USA
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John R. Thome, Professor,
John R. Thome, Professor,
Laboratory of Heat and Mass Transfer (LTCM), Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland
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Anthony M. Jacobi, Professor of Mechanical Engineering,
Department of Mechanical Engineering, University of Illinois, Urbana, IL, USA
John R. Thome, Professor,
Laboratory of Heat and Mass Transfer (LTCM), Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland
Contributed by the Heat Transfer Division for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received by the Heat Transfer Division July 31, 2001; revision received August 13, 2002. Associate Editor: V. P. Carey.
J. Heat Transfer. Dec 2002, 124(6): 1131-1136 (6 pages)
Published Online: December 3, 2002
Article history
Received:
July 31, 2001
Revised:
August 13, 2002
Online:
December 3, 2002
Citation
Jacobi, A. M., and Thome, J. R. (December 3, 2002). "Heat Transfer Model for Evaporation of Elongated Bubble Flows in Microchannels ." ASME. J. Heat Transfer. December 2002; 124(6): 1131–1136. https://doi.org/10.1115/1.1517274
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