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THMT-12. Proceedings of the Seventh International Symposium On Turbulence Heat and Mass Transfer
September, 24-27, 2012, Palermo, Italy

DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal


ISBN Print: 978-1-56700-302-4

ISSN: 2377-2816

Geometry effects in rough wall turbulent mass transfer

pages 1709-1714
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1740
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RESUMO

We report on RANS simulations of high Sc turbulent mass transfer due to a first order reaction on the surface of a d-type rough wall. We find that for low reaction coefficients, the additional surface area of the rough wall causes an increased mass transfer in comparison with a smooth wall. However, when the reaction coefficient is high, the mass transfer becomes lower than for a smooth wall. A detailed analysis shows that it is the turbulence exchange between the bulk flow and the cavity which becomes the limiting factor at high reaction coefficients.

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