Full Content is available to subscribers

Subscribe/Learn More  >

Fluctuation of Void Fraction in the Microbubble Generator With a Venturi Tube

[+] Author Affiliations
Shin-ichiro Uesawa, Akiko Kaneko, Yasumichi Nomura, Yutaka Abe

University of Tsukuba, Tsukuba, Ibaraki, Japan

Paper No. AJK2011-10014, pp. 2483-2492; 10 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


Microbubbles are tiny bubbles with less than 1 mm diameter. These bubbles are utilized in various engineering fields, and it is very important to understand physics of flow with microbubbles. Especially, void fraction is one of the significant parameter for two-phase flow. Thus, developments of real-time measurement systems of void fraction are required. In the nuclear power engineering, electrical void fraction measurement methods have been proposed as one of the real-time measurement techniques. In the present study, we apply this method to a microbubble generator with a venturi tube and examine the performance of the generator. Constant electrical current method is adopted as electrical measurement method of void fraction. Microbubbles are generated with a bubble collapse phenomenon through a venturi tube. We can generate microbubbles in high void fraction. However, mechanism of bubble collapse in a ventrui tube is not made clear and void fraction distribution toward flow direction is less understood. The applicability of constant electrical current method in bubbly flow and the process of the bubble breakup in a venturi tube are discussed. In this experiment, a voltage between two electrodes in the generator is measured with various gas-liquid volume flows as inlet conditions. From results we succeeded to measure the void fraction profile in the venturi tube with constant electrical current method. The void fractions achieve a peak before the bubble collapse and it decreased drastically for 10 mm after collapse.

Copyright © 2011 by JSME



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