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Modeling of Mixing and Precipitation Using CFD and Population Balances
Author(s) -
Paschedag A.R.
Publication year - 2004
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.200401984
Subject(s) - turbulence , mechanics , population balance equation , mixing (physics) , reynolds number , large eddy simulation , population , turbulent diffusion , precipitation , eddy diffusion , computational fluid dynamics , statistical physics , diffusion , dispersion (optics) , thermodynamics , meteorology , physics , demography , optics , quantum mechanics , sociology
Simulations of particle size distributions in technical precipitation reactors require the consideration of turbulent mixing and precipitation kinetics. For that, spatially resolved population balances have to be evaluated. In turbulent flows these balances cannot be solved directly, instead either Reynolds averaging or Large Eddy Simulations have to be applied, while unresolved fluctuations need to be modeled. Reynolds averaging of the population balance leads to a turbulent growth dispersion term which has to be modeled. As no theoretically founded approach is available, an assumption was made in analogy to the turbulent diffusion, which improves the prediction of the size distribution shape compared to experiments.