Towards quantitative prediction of aerosol deposition from turbulent flows

Towards quantitative prediction of aerosol deposition from turbulent flows Predictions of aerosol deposition rates from turbulent flow using computational fluid dynamics simulations have been compared with experimental data. The influence of turbulence model choice has been assessed. The use of isotropic turbulence models resulted in over-prediction of V + by more than 3 orders of magnitude for τ + ∼ 0.2 , whilst the anisotropic RSM gave results in good agreement with experiment. For τ + > 10 ( d p ∼ 10 μ m for Re = 9894 ) there was little difference between the turbulence models. Simulations for both Re = 9894 and 50,000 were carried out and good performance was seen for both. The effect of drag model was assessed and resulted in little difference in predicted deposition velocity. The influence of grid resolution was also investigated and it was seen that the cell centre of the wall-adjacent cell should be at a distance of y + = 2 or less for quantitative prediction of deposition. Coarser grids resulted in over-prediction for low τ + . http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Aerosol Science Elsevier

Towards quantitative prediction of aerosol deposition from turbulent flows

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Publisher
Elsevier
Copyright
Copyright © 2007 Elsevier Ltd
ISSN
0021-8502
eISSN
1879-1964
D.O.I.
10.1016/j.jaerosci.2007.10.002
Publisher site
See Article on Publisher Site

Abstract

Predictions of aerosol deposition rates from turbulent flow using computational fluid dynamics simulations have been compared with experimental data. The influence of turbulence model choice has been assessed. The use of isotropic turbulence models resulted in over-prediction of V + by more than 3 orders of magnitude for τ + ∼ 0.2 , whilst the anisotropic RSM gave results in good agreement with experiment. For τ + > 10 ( d p ∼ 10 μ m for Re = 9894 ) there was little difference between the turbulence models. Simulations for both Re = 9894 and 50,000 were carried out and good performance was seen for both. The effect of drag model was assessed and resulted in little difference in predicted deposition velocity. The influence of grid resolution was also investigated and it was seen that the cell centre of the wall-adjacent cell should be at a distance of y + = 2 or less for quantitative prediction of deposition. Coarser grids resulted in over-prediction for low τ + .

Journal

Journal of Aerosol ScienceElsevier

Published: Feb 1, 2008

References

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