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Quenching of Hot Wall of Vertical-Narrow-Annular Passages by Gravitational Liquid Penetration

[+] Author Affiliations
Yasuo Koizumi, Hiroyasu Ohtake, Masanori Tsukudo, Naoki Sakamoto

Kogakuin University, Tokyo, Japan

Paper No. IMECE2003-41621, pp. 61-68; 8 pages
doi:10.1115/IMECE2003-41621
From:
  • ASME 2003 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 4
  • Washington, DC, USA, November 15–21, 2003
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3718-1 | eISBN: 0-7918-4663-6, 0-7918-4664-4, 0-7918-4665-2
  • Copyright © 2003 by ASME

abstract

Quenching of a thin gap annular flow passage by gravitational liquid penetration was examined experimentally by using R-113. The outer wall was made of copper. The inner wall was made of copper or glass. The inner diameters of the outer wall of the annular flow passages were 40 and 41 mm and the outer diameters of the inner wall were 38, 36 and 30 mm. By combining these, the annular gap spacings tested were 0.5, 1.0, 2.0 and 5.0 mm. Quenching was observed for the gap spacing δ ≥ 1.0 mm. When the spacing δ < 1.0 mm, the wall was gradually and monotonously cooled down without any quenching. When the bottom of the flow channel was closed and the gap spacing δ ≥ 2.0 mm, liquid fell down into the flow passage without quenching the hot wall and accumulated in the flow channel. Then, the hot wall quenching proceeded upward from the bottom with the accumulation of liquid. When δ = 1.0 mm, the quenching propagated downward from the top. The relation between wall superheat ΔTsat and the wall heat flux q is quite similar to the boiling curve of the usual pool boiling. The heat flux during the film and the transition boiling period and the peak heat flux decreased as the gap spacing became narrow. It was supposed that the decrease in the heat flux with the gap spacing decrease related to the decrease in the surface area covered with liquid based upon the flow state visual observation. A peak heat flux during quenching was close to the critical heat flux in pool boiling when the annular gap spacing δ = 5.0 mm. As δ became narrow, the peak heat flux decreased considerably. This tendency was similar to that of the Monde correlation. However, the value was much smaller than that of the correlation. The peak heat fluxes obtained in the present experimental condition was very close to critical heat fluxes of the counter-current two-phase flow in the vertical-narrow-annular flow passages.

Copyright © 2003 by ASME

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