Abstract
The mixing layer can be viewed as a good prototype of real flows where instability mechanisms, associated with mean velocity shears, produce large coherent structures which strongly influence transport, mixing and diffusion of scalar quantities such as temperature or any tracer concentration (Lesieur 1987). The behaviour of a passive scalar in mixing layers which has been widely documented (e.g. Comte et al. 1987, Comte et al. 1989, Normand et al. 1988) is significantly altered when the scalar is the concentration of species which undergo chemical reactions. The strongly coherent structures of the mixing layer influence dramatically mixing properties of the flow field, and then the efficiency of chemical reactions which can be boosted by streams which help to put reacting species closer ones to the others and drain products away. Turbulent mixing acts through a continuous distribution of length and time scales ranging from small scales where diffusive processes dominate to large scales which are ruled by the most prominent coherent structures.
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© 1991 Springer Science+Business Media Dordrecht
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Chollet, JP., Vallcorba, MR., Gathmann, R. (1991). Reactive Scalar as a Tracer of Organized Structures in Turbulent Mixing Layers. In: Metais, O., Lesieur, M. (eds) Turbulence and Coherent Structures. Fluid Mechanics and Its Applications, vol 2. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-7904-9_32
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DOI: https://doi.org/10.1007/978-94-015-7904-9_32
Publisher Name: Springer, Dordrecht
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