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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

Second-order chemical reaction micro- and macromixing in a plane turbulent channel

pages 962-973
DOI: 10.1615/ICHMT.2012.ProcSevIntSympTurbHeatTransfPal.1020
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ABSTRAKT

We analyze a database obtained from a direct numerical simulation of the reacting flow in a plane channel at low Reynolds number (Reτ = 180). The fluctuations of the concentration of the chemical species that react following a second-order chemical reaction (Da = 1, Sc = 0.7) are processed to determine the contribution of the large scale and small scale fluctuations along streamwise direction. The analysis is extended to educe the flow structures responsible for the large fluctuations of concentration. The conditional sampling technique used reveals that hairpin-shape vortices that convect flow from the walls towards the center of the channel produce the extreme fluctuations.

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