Dryout and wall-temperature fluctuations in helically coiled evaporating tubes

Journal Article · Mon Jul 01 04:00:00 EDT 1996 · Heat Transfer - Japanese Research

OSTI ID:276275

Kaji, Masuo; Mori, Koji ^[1]; Nakanishi, Shigeyasu ^[2]; Ohishi, Masaya ^[3]; Hirabayashi, Kentaro

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1. Osaka Univ. (Japan)
2. Ryukoku Univ., Nishihara, Okinawa (Japan). Dept. of Mechanical Engineering
3. Ishikawajima-Harima Heavy Industries Co., Ltd., Tokyo (Japan)

An experimental study on dryout characteristics of helically coiled tubes was conducted by measuring wall-temperature fluctuations near the dryout point. The region where the wall temperature fluctuations were observed in the coiled tube was wider than that in a straight tube. Circumferential wall temperature differences near the dryout point became significant when the coil diameter was small and the mass flow rate was low. The dryout mechanism in the coiled tube is discussed on the basis of the flow pattern map constructed by the author`s air-water experimental results. Critical heat fluxes in helically coiled tubes, which were higher than that in a straight tube, were compared with empirical correlations. Comparing the present results with Katto`s correlation for a straight tube, a modified correlation was presented.

• OSTI ID: 276275
• Journal Information: Heat Transfer - Japanese Research, Journal Name: Heat Transfer - Japanese Research Journal Issue: 3 Vol. 24; ISSN 0096-0802; ISSN HTJPAU
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
DRYOUT
HEAT EXCHANGERS
HELICAL CONFIGURATION
MULTIPHASE FLOW
TEMPERATURE DISTRIBUTION