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Conditional statistics for passive-scalar mixing in a confined rectangular turbulent jet.
- Source :
- Physics of Fluids; May2007, Vol. 19 Issue 5, p055104, 17p, 2 Diagrams, 15 Graphs
- Publication Year :
- 2007
-
Abstract
- Experimental results for the conditional statistics, such as the velocity conditioned on a conserved scalar and the scalar conditioned on velocity, in a confined liquid-phase rectangular jet are presented and analyzed for a data set collected using simultaneous particle image velocimetry and planar laser-induced fluorescence. The joint velocity-scalar probability density function (PDF) is not joint Gaussian in this flow, as the PDF of the conserved scalar is accurately described by a beta-PDF. The conditional mean velocity is found to agree with a linear model when the scalar is close to its local mean value. A gradient PDF model is found to give poor predictions for the streamwise conditional velocity. However, the improved gradient PDF model predicts both the streamwise and transverse conditional velocities well. A linear model for the scalar fluctuation conditioned on velocity is also tested against the experimental data, showing that this model only obtains good approximations when the joint velocity-scalar PDF approaches a joint Gaussian at farther downstream locations in this flow. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 10706631
- Volume :
- 19
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- Physics of Fluids
- Publication Type :
- Academic Journal
- Accession number :
- 25298304
- Full Text :
- https://doi.org/10.1063/1.2718580