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Bubbling From Microscopic Holes Into Pool Water Simulating Nucleate Boiling: Bubble Coalescence and Water Layer Under the Coalescent Bubble

[+] Author Affiliations
Yasuo Koizumi, Kenichiro Iitani, Hiroyasu Ohtake

Kogakuin University, Tokyo, Japan

Paper No. IMECE2002-33221, pp. 147-151; 5 pages
doi:10.1115/IMECE2002-33221
From:
  • ASME 2002 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 1
  • New Orleans, Louisiana, USA, November 17–22, 2002
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-3632-0 | eISBN: 0-7918-1691-5, 0-7918-1692-3, 0-7918-1693-1
  • Copyright © 2002 by ASME

abstract

Air bubbling into stagnant water from microscopic holes was examined. As the blowing-out velocity was increased, bubbles became to coalescence each other after detachment from the holes and formed coalescent bubbles. Large bubbles departed from the coalescent bubbles intermittently. When the bubbles on the surface became large, the bubbles coalesced on the surface to form the coalescent-large bubble. The distance between the bottom wall and the coalescent bubble, which is often referred to as the thickness of the macro layer in the nucleate boiling, tended toward increasing with an increase in the blowing-out velocity contrary to the macro-layer theory. It was suggested that the occurrence of the CHF condition could be explained by combining the bubble crowding on the surface (the bubble crowding model) and the periodical leave of the coalescent bubble from the surface (the macro layer model).

Copyright © 2002 by ASME

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