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Comparison of Subgrid Closure Methods for Passive Scalar Variance at High Schmidt Number
Author(s) -
Wojtas Krzysztof,
Makowski Łukasz,
Orciuch Wojciech,
Bałdyga Jerzy
Publication year - 2015
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201400646
Subject(s) - schmidt number , planar laser induced fluorescence , scalar (mathematics) , turbulence , reynolds number , closure (psychology) , statistical physics , mechanics , variance (accounting) , mathematics , scale (ratio) , thermodynamics , physics , laser , optics , geometry , laser induced fluorescence , accounting , business , quantum mechanics , economics , market economy
Abstract The subgrid closure for fluctuations of the passive scalar in liquids is investigated. Simulation results of the concentration variance based on the literature subgrid‐scale models are compared with experimental findings obtained by planar laser‐induced fluorescence measurements in a tubular reactor with T‐shaped mixing head. The new coefficient for the proposed dynamic subgrid‐scale model takes into account the spatial variation of the turbulence Reynolds number and depends on the Schmidt number and the numerical cell size. The model suggested provides excellent predictions of the concentration variance.