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TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

Flow Boiling Heat Transfer in Microchannels

[+] Author and Article Information
Dong Liu1

Cooling Technologies Research Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088dongliu@ecn.purdue.edu

Suresh V. Garimella

Cooling Technologies Research Center, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907-2088sureshg@ecn.purdue.edu

1

Corresponding author.

J. Heat Transfer 129(10), 1321-1332 (Dec 14, 2006) (12 pages) doi:10.1115/1.2754944 History: Received August 21, 2006; Revised December 14, 2006

Flow boiling heat transfer to water in microchannels is experimentally investigated. The dimensions of the microchannels considered are 275×636 and 406×1063μm2. The experiments are conducted at inlet water temperatures in the range of 6795°C and mass fluxes of 2211283kgm2s. The maximum heat flux investigated in the tests is 129Wcm2 and the maximum exit quality is 0.2. Convective boiling heat transfer coefficients are measured and compared to predictions from existing correlations for larger channels. While an existing correlation was found to provide satisfactory prediction of the heat transfer coefficient in subcooled boiling in microchannels, saturated boiling was not well predicted by the correlations for macrochannels. A new superposition model is developed to correlate the heat transfer data in the saturated boiling regime in microchannel flows. In this model, specific features of flow boiling in microchannels are incorporated while deriving analytical solutions for the convection enhancement factor and nucleate boiling suppression factor. Good agreement with the experimental measurements indicates that this model is suitable for use in analyzing boiling heat transfer in microchannel flows.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Experimental setup for studying flow boiling in a microchannel heat sink: (a) test loop, (b) test piece assembly, and (c) cross-sectional view of the microchannel test piece

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Figure 2

Boiling curve: variation of wall temperature and heat flux during flow boiling in channels

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Figure 3

Boiling curve, case I-1 (G=324kg∕m2s, Tf,in=66.6°C)

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Figure 4

Effect of inlet temperature on the boiling curves (wall temperature measured for microchannel I at Tw,3)

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Figure 5

Effect of inlet velocity on boiling curves (wall temperature measured for microchannel I)

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Figure 6

Pressure drop, case I-1 (G=324kg∕m2s, Tf,in=66.6°C)

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Figure 7

Three boiling regimes in a microchannel, case II-10 (G=330kg∕m2s, Tf,in=92.1°C)

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Figure 8

Subcooled boiling heat transfer coefficient, case I-13 (G=921kg∕m2s, Tf,in=78.3°C)

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Figure 9

Convective enhancement factor F as a function of laminar Martinelli parameter

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Figure 10

Suppression factor S as a function of two-phase Reynolds number

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Figure 11

Saturated boiling heat transfer coefficient, case II-2 (G=221kg∕m2s, Tf,in=91.7°C)

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Figure 12

Comparison of measured boiling heat transfer coefficients with those predicted with S factor obtained from analytical approach (Eq. 37) (G=221–1283kg∕m2s, Tf,in=66.6–95.4°C)

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Figure 13

Comparison of measured boiling heat transfer coefficients with those predicted with S factor obtained from regression analysis (Eq. 44) (G=221–1283kg∕m2s, Tf,in=66.6–95.4°C)

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Figure 14

Boiling heat transfer coefficient over subcooled and saturated regimes, case II-2

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