A Photographic Technique for Measuring Fluid Velocities with Tracer Particles

This paper presents theoretical and experimental aspects associated with the use of neutrally buoyant tracer particles for defining fluid motion with cine photography. A dimensionless-parameter argument, based on particle size, leads to a criterion for determining when particle and fluid velocities are equivalent. The authors assert that results which do not vary with particle size do not contain deviations due to the presence of particles, assuming a particle size ratio greater than 2. Two applications are presented along with two carrier fluid-particle systems. Details of the photographic technique are included, indicating a procedure for determination of velocity components from two mutually perpendicular views of the tracer particles.

Print ISSN

0361-4573

Published

1973-11

Content type

Original Research

DOI

10.5594/J07660