Experiments in Fluids

, Volume 29, Supplement 1, pp S078–S084

Defocusing digital particle image velocimetry: a 3-component 3-dimensional DPIV measurement technique. Application to bubbly flows

  • F. Pereira
  • M. Gharib
  • D. Dabiri
  • D. Modarress

DOI: 10.1007/s003480070010

Cite this article as:
Pereira, F., Gharib, M., Dabiri, D. et al. Experiments in Fluids (2000) 29(Suppl 1): S078. doi:10.1007/s003480070010

Abstract

This paper describes a three-dimensional imaging system for the purpose of mapping two-phase bubbly flows. The defocusing digital particle image velocimetry instrument records high resolution images of the bubble field and is capable of providing bubble size and bubble location within a cubic foot volume. The velocity field is calculated from the volumetric cross-correlation of consecutive three-dimensional sets of bubble locations. The bubble size information is estimated from the bubble scattered peak intensity. Both quantities correlate following a power law, as predicted by the Mie scattering theory. The technique is applied to the study of the dynamics of sub-millimeter air bubbles in a three-dimensional vortical flow generated by a propeller. Velocity, bubble size distribution and void fraction are briefly discussed.

Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • F. Pereira
    • 1
  • M. Gharib
    • 1
  • D. Dabiri
    • 1
  • D. Modarress
    • 1
  1. 1.Center for Quantitative Visualization California Institute of Technology Pasadena, CA 91125, USAUS