Heat-transfer characteristics in two-phase double-tube thermosiphons

Journal Article · Mon Dec 31 23:00:00 EST 1990 · Heat Transfer - Japanese Research; (United States)

OSTI ID:7109575

Imura, H ^[1]; Yoshida, M ^[2]

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1. Kumamoto Univ. (Japan). Faculty of Engineering
2. Dept. of Mechanical Engineering, Ariake National College of Technology (JP)

This paper reports on an experimental study on heat-transfer coefficients and the critical heat flux in two-phase double-tube thermosiphons which was carried out, using water, ethanol and Freon 113 (R-113) as the working liquids. The same experiment for a single-tube thermosiphon was also performed for comparison. The effects of the top-end shape of the inner tubes on the heat-transfer coefficients and the critical heat flux were investigated in detail. As a result, it was shown that the heat-transfer coefficient was not significantly affected by the difference of the top-end shape, but the critical heat flux was very sensitive to the top-end shape of the inner tubes. For R-113, the critical heat flux in the thermosiphon with the inner tube or T- or disk-shape top-end, was more than four times as large as that in the single-tube thermosiphon.

• OSTI ID: 7109575
• Journal Information: Heat Transfer - Japanese Research; (United States), Journal Name: Heat Transfer - Japanese Research; (United States) Vol. 20:8; ISSN 0096-0802; ISSN HTJPA
• Country of Publication: United States
• Language: English

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