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RESEARCH PAPERS: Micro/Nanoscale Heat Transfer

Reduced Pressure Boiling Heat Transfer in Rectangular Microchannels With Interconnected Reentrant Cavities

[+] Author and Article Information
Ali Koşar, Chih-Jung Kuo

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180

Yoav Peles1

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180pelesy@rpi.edu

1

To whom correspondence should be addressed.

J. Heat Transfer 127(10), 1106-1114 (May 05, 2005) (9 pages) doi:10.1115/1.2035107 History: Received February 19, 2005; Revised May 05, 2005

Boiling flow of deionized water through 227μm hydraulic diameter microchannels with 7.5μm wide interconnected reentrant cavities at 47 kPa exit pressure has been investigated. Average two-phase heat transfer coefficients have been obtained over effective heat fluxes ranging from 28 to 445Wcm2 and mass fluxes from 41 to 302kgm2s. A map is developed that divides the data into two regions where the heat transfer mechanisms are nucleation or convective boiling dominant. The map is compared to similar atmospheric exit pressure data developed in a previous study. A boiling mechanism transition criterion based on the Reynolds number and the Kandlikar k1 number is proposed.

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Copyright © 2005 by American Society of Mechanical Engineers
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Figures

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Figure 1

(a) Computer-aided design model of the microchannel device, (b) dimensions of reentrant cavities, (c) SEM image of re-entrant cavities, (d) geometry of the inlet region, (e) geometry of the re-entrant cavity, and (f) flow distributive pillars

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Figure 2

Experimental setup

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Figure 3

Heat losses for G=302kg∕m2s

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Figure 4

Boiling curves for water at 47 kPa (qeff″ versus T¯)

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Figure 5

Nucleation from reentrant cavities (q″=77.4W∕cm2, G=166kg∕m2s)

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Figure 6

Two-phase heat transfer coefficients for water at 47 kPa (htp versus q″)

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Figure 7

Two-phase heat transfer coefficients for water at 47 kPa (htp versus xe):(a) G=41kg∕m2s, (b) G=83kg∕m2s, (c) G=166kg∕m2s, and (d) G=302kg∕m2s

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Figure 8

Comparison of heat transfer coefficients with heat flux at reduced and atmospheric exit pressures: (a) G=41kg∕m2s, (b) G=83kg∕m2s, (c) G=166kg∕m2s, and (d) G=302kg∕m2s

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Figure 9

Comparison of heat transfer coefficients with exit quality at reduced and atmospheric exit pressures

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Figure 10

Comparison of heat transfer mechanism reduced and atmospheric exit pressure data

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Figure 11

Heat transfer mechanism map with reduced and atmospheric exit pressure data

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Figure 12

qCHF″ dependence on G

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Figure 13

qCHF″ dependence on xe

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