Terminal velocity of single bubbles in surface tension force dominant regime

A. Tomiyama, G.P. Celata, S. Hosokawa, S. Yoshida

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Abstract

Terminal velocity VTof a single bubble rising through an infinite stagnant liquid in surface tension force dominant regime was investigated theoretically and experimentally. A theoretical VTmodel, which is applicable to a distorted spheroidal bubble with a high bubble Reynolds number, was deduced from a jump condition and a potential flow theory for a flow about an oblate spheroid. Experiments were conducted using air and water to measure bubble trajectories, shapes and velocities. As a result, it was confirmed that (1) the primal cause of widely scattered VTin this regime is not surfactant concentration but initial shape deformation, (2) small initial shape deformation results in a low VTand a high aspect ratio, whereas large initial shape deformation results in a high VTand a low aspect ratio, (3) the primal role of surfactants in this regime is to cause the damping of shape oscillation, by which a contaminated bubble behaves as if it were a clean bubble with low initial shape deformation, and (4) the proposed model gives good predictions of VTfor single distorted bubbles. © 2002 Elsevier Science Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1497 - 1519
Number of pages23
JournalInternational Journal of Multiphase Flow
Volume28
Issue number9
DOIs
Publication statusPublished - Sep 2002

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All Science Journal Classification (ASJC) codes

  • Mechanical Engineering
  • Physics and Astronomy(all)
  • Fluid Flow and Transfer Processes

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