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TECHNICAL BRIEFS

Heat Transfer and Bubble Movement of Two-Side and One-Side Heating Subcooled Flow Boiling in Vertical Narrow Channels

[+] Author and Article Information
Liang-Ming Pan, Chuan He, Ming-dao Xin

 Institute of Engineering Thermophysics of Chongqing University, Chongqing 400044, China

Tien-Chien Jen

Mechanical Engineering Department, University of Wisconsin at Milwaukee, Milwaukee, WI 53211jent@uwm.edu

Qing-hua Chen

Mechanical Engineering Department, University of Wisconsin at Milwaukee, Milwaukee, WI 53211

J. Heat Transfer 128(8), 838-842 (Mar 08, 2006) (5 pages) doi:10.1115/1.2227040 History: Received June 09, 2005; Revised March 08, 2006

This paper investigates the bubble behavior of different heating methods of narrow rectangular channels. Comparisons were made on the onset of nucleate boiling (ONB) point and bubble behavior with various flow patterns. Results reveal that the wall superheat of two-side heating is lower than that in one-side heating at the same heat flux. This difference becomes obvious at a higher heat flux. Under the same subcooling condition, the required heat flux to start nucleate boiling for the one-side heating channel is higher than that for the two-side one. With similar bubbles behaviors, the cross-sectional subcooling tends to be higher for the two-side heating method.

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Copyright © 2006 by American Society of Mechanical Engineers
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Figures

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Figure 5

Bubble morphology in different heating conditions: (a) two-side heating, (b) one-side heating, (c) two-side heating, (d) one-side heating, (e) two-side heating, and (f) one-side heating

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Figure 4

Subcooling of liquid versus the ONB point of one-side and two-side heating

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Figure 3

Wall superheat versus the ONB point of one-side and two-side heating as well as the prediction of Frost and Dzakowic (see Ref. [18])

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Figure 2

Cross-sectional view of test section

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Figure 1

Schematic diagram of test loop of R12

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