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Technical Briefs

Two-Phase Convective Heat Transfer in Miniature Pipes Under Normal and Microgravity Conditions

[+] Author and Article Information
Chidambaram Narayanan

 ASCOMP GmbH, Technoparkstrasse 1, 8005 Zurich, Switzerland

Djamel Lakehal1

 ASCOMP GmbH, Technoparkstrasse 1, 8005 Zurich, Switzerlandlakehal@ascomp.ch

1

Corresponding author.

J. Heat Transfer 130(7), 074502 (May 16, 2008) (5 pages) doi:10.1115/1.2909076 History: Received April 02, 2007; Revised October 03, 2007; Published May 16, 2008

Detailed numerical simulations have been performed to study the effect of flow orientation with respect to gravity on two-phase flow heat transfer (without phase change) in small diameter pipes. The Nusselt number distribution shows that the bubbly, slug, and slug-train regimes transport as much as three to four times more heat from the tube wall to the bulk flow than pure water flow. The flow blockage effect of the inclusions results in a circulating liquid flow superimposed on the mean flow. For upflow, the breakup into bubbles/slugs occurs earlier and at a higher frequency. The average Nusselt numbers are not significantly affected by the flow orientation with respect to gravity. A mechanistic heat transfer model based on frequency and length scale of inclusions is also presented.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Flow evolution under normal- and microgravity conditions. Domain: 18–32 D. Scale: Higher temperature corresponds to darker shade.

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Figure 2

Nusselt number distribution along the axis under normal- and microgravity conditions

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Figure 3

Detailed view of Nusselt number distribution under normal- and microgravity conditions

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Figure 4

Total and defect flow fields

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Figure 5

Nusselt number correlation as a function of Reynolds number

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Figure 6

Pressure variation along the pipe for normal- and microgravity conditions

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Figure 7

Slug breakup under normal- and microgravity conditions

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