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Mean Rise-Rate of Droplets in Isotropic Turbulence

[+] Author Affiliations
P. D. Friedman

U.S. Naval Academy, Annapolis, MD

J. Katz

Johns Hopkins University, Baltimore, MD

Paper No. FEDSM2002-31025, pp. 473-478; 6 pages
doi:10.1115/FEDSM2002-31025
From:
  • ASME 2002 Joint U.S.-European Fluids Engineering Division Conference
  • Volume 1: Fora, Parts A and B
  • Montreal, Quebec, Canada, July 14–18, 2002
  • Conference Sponsors: Fluids Engineering Division
  • ISBN: 0-7918-3615-0 | eISBN: 0-7918-3600-2
  • Copyright © 2002 by ASME

abstract

This paper investigates the rise-rate of droplets that are slightly lighter than the surrounding fluid. We experimentally investigate the effect of three parameters: Stokes number, turbulence intensity and droplet Reynolds number. Droplets were injected into a chamber with nearly isotropic turbulence and little mean flow. The results show that at high turbulence intensity, the mean droplet rise-rate is 25% of the rms velocity regardless of the Stokes number, while at low turbulence intensity, the droplets rise at a rate equal to the rise-rate in a quiescent fluid. At intermediate turbulence intensity, the rise-rate is strongly dependent on the Stokes number.

Copyright © 2002 by ASME
Topics: Turbulence

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