Full Content is available to subscribers

Subscribe/Learn More  >

The Motion of a Bubble Swarm in Decaying Oscillating-Grid Turbulence and the Modulation of the Liquid-Phase Motion

[+] Author Affiliations
Yasuyuki Nagami, Takayuki Saito

Shizuoka University, Hamamatsu, Shizuoka, Japan

Paper No. AJK2011-10026, pp. 2541-2548; 8 pages
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference
  • ASME-JSME-KSME 2011 Joint Fluids Engineering Conference: Volume 1, Symposia – Parts A, B, C, and D
  • Hamamatsu, Japan, July 24–29, 2011
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 978-0-7918-4440-3
  • Copyright © 2011 by JSME


The modulation induced by interaction between bubble motion and liquid-phase motion is important to deeply understand the multi-scale structure of a bubbly flow. In order to quantitatively and systematically clarify the interaction between the bubble swarm and the ambient liquid-phase motion, ideally controlled turbulence and bubble swarm are required. In the present study, we employed the decaying turbulence formed by oscillating grid and a well-controlled bubble swarm launched by hypodermic needles and audio speakers. We formed homogenous isotropic turbulence by using an oscillating grid (oscillating frequency: 4 Hz, stroke: 40 mm) in a cylindrical acrylic pipe (diameter: 149 mm, height: 600 mm) filled with ion-exchanged and degassed water. The decaying turbulence was formed after stopping the oscillating grid. A bubble swarm (: the member bubble rose zigzagging in stagnant water) was launched into the decaying turbulence after two seconds from stop of the oscillating grid. We measured the bubble swarm motion by visualization and did the liquid-phase motion by PIV/LIF system with high-speed video cameras. The measurements were performed under three experimental conditions; the first one is only the decaying turbulence (Condition-O), the second one is the bubble swarm launched into the stagnant water (Condition-B), the third one is the bubble swarm launched into the decaying turbulence (Condition-OB). From the visualization results, it was found out that the positions of the bubbles were expanded in the horizontal direction compared with that under Condition-B. This indicates the transition of the bubble motion from two-dimensional motion to three-dimensional motion was enhanced by the ambient turbulence. We calculated standard deviations of the liquid-phase velocities from the PIV results. When the bubble swarm was launched into the decaying turbulence, the decay rates of the liquid-phase velocities were enhanced; i.e. the decay rates under Condition-OB were larger than those under Condition-O.

Copyright © 2011 by JSME
Topics: Motion , Turbulence , Bubbles



Interactive Graphics


Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In