Research Papers: Two-Phase Flow and Heat Transfer

The Critical Heat Flux Condition With Water in a Uniformly Heated Microtube

[+] Author and Article Information
A. P. Roday, T. Borca-Tasçiuc

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590

M. K. Jensen1

Department of Mechanical, Aerospace and Nuclear Engineering, Rensselaer Polytechnic Institute, Troy, NY 12180-3590JenseM@rpi.edu


Corresponding author.

J. Heat Transfer 130(1), 012901 (Jan 28, 2008) (10 pages) doi:10.1115/1.2780181 History: Received January 04, 2007; Revised May 11, 2007; Published January 28, 2008

The critical heat flux (CHF) condition needs to be well understood for designing miniature devices involving two-phase flow. Experiments were performed to determine the CHF condition for a single stainless steel tube having an inside diameter of 0.427mm subjected to uniform heat flux boundary conditions. The effects of mass flux, pressure, and exit quality on the CHF were investigated. The experimental results show that the CHF increases with an increase in mass flux and exit pressure. For all exit pressures, the CHF decreased with an increase in quality in the subcooled region, but with a further increase in quality (near zero quality and above), the CHF was found to have an increasing trend with quality (up to about 25% quality). CHF values in this region were much higher than those in the subcooled region. This suggests that even at very low qualities, the void fraction becomes appreciable, which results in an increase in the average velocity, thereby increasing the CHF limit.

Copyright © 2008 by American Society of Mechanical Engineers
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Figure 1

Description of test facility

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Figure 2

Test Section Assembly

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Figure 3

Δpt,expt∕Δpt,calc versus Re during single-phase flow experiment

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Figure 4

Pressure drop versus time for G=560kg∕m2s, ΔTsub=38°C, Pexit=25kPa

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Figure 5

Wall superheat versus heat flux (Pexit=25kPa; G=315kg∕m2s; ΔTsub=15°C)

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Figure 6

Axial wall temperature variation (Pexit=25kPa, 102kPa)

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Figure 7

Wall superheat versus heat flux (Pexit=102kPa; G=870kg∕m2s; ΔTsub∼4°C)

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Figure 8

Effect of mass flux on CHF for ΔTsub∼46°C, Lh=59mm

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Figure 9

Effect of inlet subcooling on CHF

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Figure 10

Variation of CHF with quality for Pexit=102kPa (abs)

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Figure 11

Variation of CHF with quality for Pexit=25kPa (abs)

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Figure 12

Variation of CHF with quality for Pexit=179kPa (abs)

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Figure 13

Comparison of subcooled CHF data with the Hall and Mudawar correlation (28)

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Figure 14

Comparison of saturated CHF data with the Zhang (22) and Qu and Mudawar correlations (29)



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