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Departure and Lift-Off Point of Bubbles at Heating Wall in Vertical Channel

[+] Author Affiliations
Liang-Ming Pan, De-Qi Chen, De-Wen Yuan, Ying-Qing He, Li Zhang

Chongqing University

Paper No. IMECE2006-13535, pp. 203-211; 9 pages
doi:10.1115/IMECE2006-13535
From:
  • ASME 2006 International Mechanical Engineering Congress and Exposition
  • Heat Transfer, Volume 2
  • Chicago, Illinois, USA, November 5 – 10, 2006
  • Conference Sponsors: Heat Transfer Division
  • ISBN: 0-7918-4785-3 | eISBN: 0-7918-3790-4
  • Copyright © 2006 by ASME

abstract

This paper proposed a theoretical model involving in conditions of bubble departure point and lift-off point, the principle and estimating method of individual forces have been proposed as well. The forces acted on growing bubble are, namely, surface tension force Fs , growth force of bubbles Fdu , shear lift force FsL , drag force of flow Fqs , hydrodynamic pressure force Fh , contact pressure force Fcp , buoyancy force Fb and bubble acceleration inertia force d(mvc )/dt as well. Horizontal and vertical momentum equations are presented according to forces balance of bubble, meanwhile, the estimating method of lean angle of bubble before departure also has been discussed.

Copyright © 2006 by ASME

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