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Research Papers

Experimental Study of Water Liquid-Vapor Two-Phase Pressure Drop Across an Array of Staggered Micropin-Fins

[+] Author and Article Information
Christopher A. Konishi

Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822

Weilin Qu1

Department of Mechanical Engineering, University of Hawaii at Manoa, Honolulu, HI 96822qu@hawaii.edu

Frank E. Pfefferkorn

Department of Mechanical Engineering, University of Wisconsin-Madison, Madison, WI 53706

1

Corresponding author.

J. Electron. Packag 131(2), 021010 (Apr 03, 2009) (8 pages) doi:10.1115/1.3104028 History: Received August 06, 2008; Revised January 06, 2009; Published April 03, 2009

This study concerns pressure drop of adiabatic water liquid-vapor two-phase flow across an array of 1950 staggered square micropin-fins having a 200×200μm cross section by 670μm height. The ratios of longitudinal pitch and transverse pitch to pin-fin equivalent diameter are equal to 2. An inline immersion heater upstream of the micropin-fin test module was employed to produce liquid-vapor two-phase mixture, which flowed across the micropin-fin array. The test module was well insulated to maintain adiabatic condition. Four maximum mass velocities of 184kg/m2s, 235kg/m2s, 337kg/m2s, and 391kg/m2s, and a range of vapor qualities for each maximum mass velocity were tested. Measured pressure drop increases drastically with increasing vapor quality. Nine existing two-phase pressure drop models and correlations were assessed. The Lockhart–Martinelli correlation for laminar liquid-laminar vapor combination in conjunction with a single-phase friction factor correlation proposed for the present micropin-fin array provided the best agreement with the data.

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Copyright © 2009 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic of flow loop

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Figure 2

Construction of test module

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Figure 3

Top view of micropin-fin array

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Figure 4

Measured ΔPsp as a function of Gmax for all Tin

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Figure 5

ffin,sp as a function of Resp for all Tin

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Figure 6

Measured ΔPtp as a function of xe for all Gmax

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Figure 7

Comparison of ΔPtp data with homogeneous equilibrium model predictions using two-phase viscosity models by (a) Dukler (12) and (b) Beattie and Whalley (13)

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Figure 8

Comparison of ΔPtp data with predictions of Lockhart–Martinelli type of correlations by (a) Lockhart–Martinelli (laminar liquid-laminar vapor) (16-17), (b) Lockhart–Martinelli (laminar liquid-turbulent vapor) (16-17), (c) Kawahara (18), (d) Mishima and Hibiki (19), and (e) Krishnamurthy and Peles (3)

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