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Turbulent Diffusion of Suspended Particles: Analysis of the Turbulent Schmidt Number

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Abstract:

For mass transfer applications, CFD codes need the turbulent Schmidt number . The aim of our study is the analysis of some theoretical closure results and analytical formulations for . We will investigate different formulations of from the basic conservation equations for sediment-water mixtures in turbulent open-channel flows based on a two-fluid description and a kinetic model. The kinetic model for turbulent two-phase flows provides which depends on particle Stokes number. Our study show that the two approaches provide that depends on turbulent kinetic energy (TKE), eddy viscosity and particles settling velocity. For the analysis, accurate analytical formulations for TKE and eddy viscosity calibrated by DNS data are presented.

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Periodical:

Defect and Diffusion Forum (Volumes 312-315)

Pages:

794-799

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.312-315.794

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Online since:

April 2011

Authors:

Rafik Absi, Stéphane Marchandon, Marc Lavarde

Keywords:

Eddy Viscosity, Suspended Particles, Turbulent Flow, Turbulent Kinetic Energy, Turbulent Schmidt Number

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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