Journal ArticleDOI
Passive scalar measurements in a planar mixing layer by PLIF of acetone
L. M. Pickett,J. B Ghandhi +1 more
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TLDR
In this paper, a planar laser-induced fluorescence of acetone seeded into one side of the layer was used to measure the fraction of mixed fluid within the layer, and the mixed fluid fraction was found to increase to an asymptotic value of 0.5 by Re ∼5,000, the approximate location of turbulent transition.Abstract:
Quantitative passive scalar measurements were performed in an incompressible planar mixing layer at Re
δ
up to 104 using planar laser-induced fluorescence of acetone seeded into one side of the layer. Probability density functions compiled from sets of images showed a preferred mixture composition, favoring the high-speed fluid, which extended across the layer. This preferred composition produced non-marching PDFs and an inflection in the average mixture fraction profile. The spatial resolution of the experiment was found to be sufficient to accurately measure the fraction of mixed fluid within the layer. The mixed fluid fraction was found to increase to an asymptotic value of 0.5 by Re
δ
≈ 5,000, the approximate location of turbulent transition, in contrast to high Schmidt number experiments which show minimal mixing before the transition point.read more
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LBM, a useful tool for mesoscale modelling of single-phase and multiphase flow
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Quantification of airborne odor plumes using planar laser-induced fluorescence
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Incident shock Mach number effects on Richtmyer-Meshkov mixing in a heavy gas layer
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Passive scalar mixing in a planar shear layer with laminar and turbulent inlet conditions
Lyle M. Pickett,Jaal Ghandhi +1 more
TL;DR: In this paper, the effect of inlet conditions on the mixing of a passive scalar was investigated in a planar shear layer with inlet boundary layers that were laminar, tripped and naturally turbulent-transitional.
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Experimental study on turbulent mixing process in cross-flow type T-junction
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