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

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

I. Sancho
Department of Mechanical Engineering, University Rovira i Virgili, Av. Paisos Catalans 26. 43007 Tarragona, Spain

A. Fabregat
Department of Mechanical Engineering, University Rovira i Virgili, Av. Paisos Catalans 26, 43007 Tarragona, Catalonia, Spain

Jordi Pallares
Department of Mechanical Engineering, University Rovira i Virgili, Avinguda dels Països Catalans 26, 43007, Tarragona, Spain

Anton Vernet
Department of Mechanical Engineering, University Rovira i Virgili, Av. Paisos Catalans 26, Tarragona, Spain 43007

Sinopsis

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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