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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Two-Phase Convective Heat Transfer in Miniature Pipes Under Normal and Microgravity Conditions
Chidambaram Narayanan,
Chidambaram Narayanan
ASCOMP GmbH
, Technoparkstrasse 1, 8005 Zurich, Switzerland
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Djamel Lakehal
Djamel Lakehal
Search for other works by this author on:
Chidambaram Narayanan
ASCOMP GmbH
, Technoparkstrasse 1, 8005 Zurich, Switzerland
Djamel Lakehal
J. Heat Transfer. Jul 2008, 130(7): 074502 (5 pages)
Published Online: May 16, 2008
Article history
Received:
April 2, 2007
Revised:
October 3, 2007
Published:
May 16, 2008
Citation
Narayanan, C., and Lakehal, D. (May 16, 2008). "Two-Phase Convective Heat Transfer in Miniature Pipes Under Normal and Microgravity Conditions." ASME. J. Heat Transfer. July 2008; 130(7): 074502. https://doi.org/10.1115/1.2909076
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