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Research Papers: Two-Phase Flow and Heat Transfer

Optimized Expanding Microchannel Geometry for Flow Boiling

[+] Author and Article Information
Mark J. Miner

e-mail: mark.miner@asu.edu

Patrick E. Phelan

e-mail: phelan@asu.edu

Jon A. Sherbeck

Mechanical & Aerospace Engineering,
Arizona State University,
Tempe, AZ 85287-6106

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the Journal of Heat Transfer. Manuscript received March 22, 2012; final manuscript received December 20, 2012; published online March 20, 2013. Assoc. Editor: W. Q. Tao.

J. Heat Transfer 135(4), 042901 (Mar 20, 2013) (8 pages) Paper No: HT-12-1126; doi: 10.1115/1.4023260 History: Received March 22, 2012; Revised December 20, 2012

This study discusses the simulation of flow boiling in a microchannel and numerically predicts the effects of channel geometry variation along the flow direction. Experimental studies by Pan and collaborators and suggestions from Mukherjee and Kandlikar have generated interest in expanding the cross section of a microchannel to improve boiling heat transfer. The motivation for this geometry change is discussed, constraints and model selection are reviewed, and Revellin and Thome's critical heat flux criterion is used to bound the simulation, via matlab, of separated flow in a heated channel. The multiphase convective heat-transfer coefficient is extracted from these results using Qu and Mudawar's relationship and is compared to reported experimental values. Expanding channel geometry permits higher heat rates before reaching critical heat flux.

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References

Figures

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Fig. 1

Kelvin–Helmholtz waves

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Differential control volume

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Iteration logic flow

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Input power distribution

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Fig. 5

Model prediction versus Qu and Mudawar data

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Single-channel height-only expansion

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Fixed base area array optimization

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Fig. 8

CHF contours in 31 channel array

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Fig. 9

Convective HTC for 31 channel simulation

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