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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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.
|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|
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|Deposited By:||Archive Administrator|
|Deposited On:||09 Dec 2006|
|Last Modified:||21 Sep 2016 23:05|
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