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Flow Structure and Pressure Loss of Two-Phase Flow in Helically Coiled Tubes

[+] Author Affiliations
Masa-aki Ishikawa, Hiroshi Oiwa, Kosuke Sakai, Yuichi Murai, Fujio Yamamoto

Fukui University, Fukui-shi, Japan

Shin-ichi Toda, Kiyoshi Tamayama

Japan Nuclear Cycle Development Institute, Tsuruga-shi, Japan

Paper No. FEDSM2003-45376, pp. 1453-1458; 6 pages
doi:10.1115/FEDSM2003-45376
From:
  • ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference
  • Volume 1: Fora, Parts A, B, C, and D
  • Honolulu, Hawaii, USA, July 6–10, 2003
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3696-7 | eISBN: 0-7918-3673-8
  • Copyright © 2003 by ASME

abstract

In the steam generator of the prototype FBR (Fast Breeder Reactor) in Japan, heat exchange tubes of helical coil type are utilized. The gas-liquid two-phase flows in the helical coil tube have different characteristic from straight tubes due to the effects of centrifugal acceleration in the curved tubes. In our study, the interfacial structure of the gas-liquid two-phase flows in the helical coil tube is visualized to provide the flow pattern map. Simultaneously, the pressure loss and its local fluctuation are measured in order to investigate the dynamic characteristics of the two-phase flow appearing in the helical coil tube. The result reveals that the bubbly flow regime extends and the stratified flow vanishes compared the gas-liquid flow in a horizontal straight tube. Moreover, the slug flow has asymmetric structure due to the effect of centrifugal acceleration. On the contrary the pressure loss is basically not remarkably different from the straight tube except the fact that the pressure has a high fluctuation component.

Copyright © 2003 by ASME

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