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On flow visualization using reflective flakes

Published online by Cambridge University Press:  20 April 2006

Ö. Savaş
Ö. Savaş
Affiliation:
School of Aerospace, Mechanical, and Nuclear Engineering, University of Oklahoma, Norman, OK 73019
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Abstract

An analysis of flow visualization using small reflective flakes is introduced. This rational analysis is based on a stochastic treatment of Jeffery's (1922) solution for the motion of ellipsoidal particles in a viscous fluid, wherein thin flakes tend to align with stream surfaces. The predicted light fields are confirmed by examples of parallel flows, the flow over a rotating disk, and the spinup from rest in a cylindrical cavity. The Tollmien–Schlichting wave packet trailing a turbulent spot is taken as an example to discuss the suitability of the technique for visualizing small-amplitude waves. Attenuation of light through a suspension is described.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 152 , March 1985 , pp. 235 - 248
Copyright
© 1985 Cambridge University Press

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