TECHNICAL PAPERS: Evaporation, Boiling, and Condensation

A Method for Assessing the Importance of Body Force on Flow Boiling CHF

[+] Author and Article Information
Hui Zhang, Issam Mudawar

Boiling and Two-phase Flow Laboratory, School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA

Mohammad M. Hasan

NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH 44135, USA

J. Heat Transfer 126(2), 161-168 (May 04, 2004) (8 pages) doi:10.1115/1.1651532 History: Received June 03, 2003; Revised November 19, 2003; Online May 04, 2004
Copyright © 2004 by ASME
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(a) Heater inserted into bottom plate of test module; and (b) Two-phase flow loop
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Flow orientation guide indicating flow direction, channel orientation, and heater location (indicated by black rectangle)
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(a) CHF regime map; and (b) Typical flow characteristics for each regime
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Sequential images of vapor layer at (a) θ=90 deg and U=1.5 m/s, (b) θ=0° and U=0.1 m/s, (c) θ=180 deg and U=0.1 m/s, (d) θ=225 deg and U=0.1 m/s, (e) θ=270 deg and U=0.1 m/s, and (f ) θ=270 deg and U=0.5 m/s
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CHF variation with orientation and flow velocity
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Comparison of CHF data for lowest and highest velocities with predictions based on previous models and correlations for 5 mm×2.5 mm rectangular channel and operating conditions of present study
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Variation of Bo/We2 with flow orientation and velocity for (a) all velocities tested and (b) U≥0.5 m/s
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Variation of 1/Fr with flow orientation and velocity for (a) all velocities tested and (b) U≥0.5 m/s
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Determination of minimum flow velocity required to overcome all body force effects on flow boiling CHF




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