Experiments in Fluids

, Volume 30, Issue 3, pp 327–338

Digital particle image velocimetry/thermometry and application to the wake of a heated circular cylinder

Authors

  • H. G. Park
    • Jet Propulsion Laboratory, California Institute of Technology Pasadena, CA 91109, USA
  • D. Dabiri
    • Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA
  • M. Gharib
    • Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, CA 91125, USA

DOI: 10.1007/s003480000199

Cite this article as:
Park, H., Dabiri, D. & Gharib, M. Experiments in Fluids (2001) 30: 327. doi:10.1007/s003480000199

Abstract

 Digital particle image velocimetry/thermometry (DPIV/T) is a technique whereby the velocity and temperature fields are obtained using thermochromic liquid crystal (TLC) seeding particles in water. In this paper, the uncertainty levels associated with temperature and velocity measurements using DPIV/T are studied. The study shows that large uncertainties are encountered when the temperature is measured from individual TLC particles. Therefore, an averaging procedure is presented which can reduce the temperature uncertainties. The uncertainty is reduced by computing the average temperature of the particles within the common specified sampling window used for standard DPIV. Using this procedure, the velocity and temperature distributions of an unsteady wake behind a heated circular cylinder are measured experimentally at Re=610. The instantaneous DPIV/T measurements are shown to be useful for computing statistical flow quantities, such as mean and velocity-temperature correlations.

Copyright information

© Springer-Verlag Berlin Heidelberg 2001