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Proceedings Paper

Measuring the probability distribution of velocity differences using homodyne correlation spectroscopy
Author(s): Gregory A. Zimmerli; K. Y. Min; Walter I. Goldburg
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Paper Abstract

A novel method of measuring the probability density of velocity differences in turbulent flow is described. The method is based on the light-scattering technique known as homodyne correlation spectroscopy. Using fiber optic probes to image two different scattering volumes in a turbulent fluid, it is possible to recover the probability density function of velocity differences without invoking Taylor's frozen turbulence assumption. The design of the instrument is described, together with the optical alignment procedure. Some of the fundamental limitations to the accuracy of the technique are discussed. Measurements of the pdf from uniform and turbulent flow are presented, where the turbulence was generated using a mechanical stirrer in a beaker of water.

Paper Details

Date Published: 13 October 1999
PDF: 8 pages
Proc. SPIE 3783, Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids, (13 October 1999); doi: 10.1117/12.365761
Show Author Affiliations
Gregory A. Zimmerli, National Ctr. for Microgravity Research (United States)
K. Y. Min, General Vacuum, Inc. (United States)
Walter I. Goldburg, Univ. of Pittsburgh (United States)

Published in SPIE Proceedings Vol. 3783:
Optical Diagnostics for Fluids/Heat/Combustion and Photomechanics for Solids
Soyoung Stephen Cha; Peter John Bryanston-Cross; Carolyn R. Mercer, Editor(s)

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