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Research Papers

Correlation for Flow Boiling Critical Heat Flux in Thin Rectangular Channels

[+] Author and Article Information
Futoshi Tanaka1

Graduate School of Energy Science, Kyoto University; and  Mitsubishi Heavy Industries, LTD., 16-5, Konan 2-Chome, Minato-ku, Tokyo 108-8215, Japanf_tanaka@mhi.co.jp

Takashi Hibiki

School of Nuclear Engineering, Purdue University, Nuclear Engineering Building, Room 132C, 400 Central Drive, West Lafayette, IN 47907-2017hibiki@ecn.purdue.edu

Kaichiro Mishima

Research Reactor Institute, Kyoto University, Kumatori, Sennan, Osaka 590-0494, Japan; and Institute of Nuclear Safety System, Incorporated, 64 Sata, Mihama-cho, Mikata-gun, Fukui 919-1205 Japanmishima@rri.kyoto-u.ac.jp; mishima.kaichiro@inss.co.jp

1

Corresponding author.

J. Heat Transfer 131(12), 121003 (Oct 15, 2009) (7 pages) doi:10.1115/1.3216037 History: Received September 11, 2007; Revised December 22, 2008; Published October 15, 2009

The effect of heated length on critical heat flux (CHF) in thin rectangular channels under atmospheric pressure has been studied. CHF in small channels has been widely studied in the last decades but most of the studies are based on flow in round tubes and number of studies focused on rectangular channels is relatively small. Although basic triggering mechanisms, which lead to CHF in thin rectangular channels, are similar to that of tubes, applicability of thermal hydraulic correlations developed for tubes to rectangular channels are questionable since heat transfer in rectangular channels are affected by the existence of nonheated walls and the noncircular geometry of channel circumference. Several studies of CHF in thin rectangular channels have been reported in relation to thermal hydraulic design of research reactors and neutron source targets and correlations have been proposed, but the studies mostly focus on geometrical conditions of the application of interest and therefore effect of channel parameters exceeding their interest is not fully understood. In his study, CHF data for thin rectangular channels have been collected from previous studies and the effect of heated length on CHF was examined. Existing correlations were verified with data with positive quality outlet flow but none of the correlations successfully reproduced the data for a wide range of heated lengths. A new CHF correlation for quality region applicable to a wide range of heated lengths has been developed based on the collected data.

Copyright © 2009 by American Society of Mechanical Engineers
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References

Figures

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Figure 6

Comparison of saturated CHF data with the correlation of Sudo (8)

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Figure 7

Comparison of saturated CHF data with the correlation of Qu and Mudawar (16)

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Figure 8

Comparison of saturated CHF data with the correlation of Zhang (14)

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Figure 9

Comparison of force convection related CHF term with the mass flux

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Figure 1

Variation in CHF with mass flux in thin rectangular channels

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Figure 2

Variation in exit quality of CHF with mass flux in thin rectangular channels

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Figure 3

Comparison of CHF conditions with the flow regime map

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Figure 4

Comparison of saturated CHF data with the correlation of Katto (18)

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Figure 5

Comparison of saturated CHF data with the correlation of Mishima and Nishihara (4)

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Figure 13

Comparison of the new correlation with CHF data obtained in channels with different heated length

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Figure 14

Effect of heated length on CHF in different mass flux conditions

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Figure 15

Comparison of the new correlation with CHF data for working fluids other than water

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Figure 10

Determination of L/De dependency in thin rectangular channels

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Figure 11

Comparison of parameter C with L/De

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Figure 12

Evaluation of the new developed correlation with saturated CHF data

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