Local microbubble concentration by defocused volumetric shadowgraphy with a single camera

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Abstract

The challenge presented in this research is to determine the local volumetric bubble concentration (or void fraction) in the center of a microbubble cloud with limited optical access and without disturbing the flow. By applying defocused volumetric shadowgraphy to an aerated water column we were able to measure the characteristics of single microbubbles in the control volume for a void fraction of 0.078 percent. The time-averaged local bubble concentration in the center of the water column was measured over four periods (800 seconds each) to investigate the repeatability. Two reference methods, based on differential pressure (ΦV = 0.081 percent ± 0.011) and direct observation of the bubble's in-depth z-position, both validate the results independently.
Original languageEnglish
Title of host publicationProceedings 18th International Symposium on Flow Visualization
EditorsThomas Rösgen
Place of PublicationZürich, Switzerland
PublisherETH Zürich
Number of pages11
DOIs
Publication statusPublished - 2018
EventISFV18: 18th International Symposium on Flow Visualization - Zürich, Switzerland
Duration: 26 Jun 201829 Jun 2018
Conference number: 18
http://www.isfv18.ethz.ch/

Conference

ConferenceISFV18: 18th International Symposium on Flow Visualization
Abbreviated titleISFV18
CountrySwitzerland
CityZürich
Period26/06/1829/06/18
Internet address

Keywords

  • local bubble concentration
  • defocused volumetric shadowgraphy
  • microbubbles
  • two-phase
  • flow induced by rising gas bubbles
  • defocused shadowgraphy imaging
  • local void fraction
  • single camera
  • imaging

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