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Stochastic geometric properties of scalar interfaces in turbulent jets

Miller, Paul L. and Dimotakis, Paul E. (1991) Stochastic geometric properties of scalar interfaces in turbulent jets. Physics of Fluids A, 3 (1). pp. 168-177. ISSN 0899-8213. http://resolver.caltech.edu/CaltechAUTHORS:MILpofa91a

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Abstract

Experiments were conducted in which the behavior of scalar interfaces in turbulent jets was examined, using laser-induced fluorescence (LIF) techniques. The experiments were carried out in a high Schmidt number fluid (water), on the jet centerline, over a jet Reynolds number range of 1000<=Re<=24 000. Both two-dimensional scalar data, c(r,t) at fixed x/d, and one-dimensional scalar data, c(t) at fixed x/d and r/x, were analyzed using standard one- and two-dimensional fractal box-counting algorithms. Careful treatment was given to the handling of noise. Both long and short records as well as off-centerline measurements were also investigated. The important effect of threshold upon the results is discussed. No evidence was found of a constant (power-law) fractal dimension over the range of Reynolds numbers studied. On the other hand, the results are consistent with the computed behavior of a simple stochastic model of interface geometry.


Item Type:Article
Additional Information:© 1991 The American Physical Society. (Received 26 July 1989; accepted 14 September 1990)
Subject Keywords:TURBULENT FLOW; JETS; STOCHASTIC PROCESSES; SCALARS; INTERFACES; FLUORESCENCE SPECTROSCOPY; LASER SPECTROSCOPY; WATER; REYNOLDS NUMBER; ALGORITHMS; ONE–DIMENSIONAL CALCULATIONS; TWO–DIMENSIONAL CALCULATIONS; THRESHOLD ENERGY; FRACTALS
Record Number:CaltechAUTHORS:MILpofa91a
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:MILpofa91a
Alternative URL:http://dx.doi.org/10.1063/1.857876
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:6439
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:09 Dec 2006
Last Modified:26 Dec 2012 09:21

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