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Recent Advances in Turbulent Mixing

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Mechanics for a New Mellennium

Abstract

Experimental, modeling, and direct-numerical-simulation (DNS) studies have advanced our understanding of turbulence and mixing. The mixing transition that occurs across a broad spectrum of flows at outerscale Reynolds numbers in the vicinity of Re δ ≈ 1−2 × 10 4, or Taylor Reynolds numbers of Re T ≈ 100−140 will be discussed. Inflow-/initial-condition effects in high-Re shear layers will also be discussed. Comparisons between DNS studies of strained diffusion-flame regions and experiments in chemically reacting shear layers provide some new insight in the overall chemical-product formation. DNS studies of the Rayleigh-Taylor instability (RTI) between miscible fluids, with identical boundary conditions and different initial perturbations, reveal an initial-growth regime dominated by diffusion, with a subsequent nonlinear growth that depends on the details of the initial perturbations for as long as the simulations were run. Mixing in RTI flow is found even more sensitively dependent on initial conditions. The discussion concludes with some general comments on high-Re turbulence.

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Authors and Affiliations

  1. Graduate Aeronautical Laboratories, California Institute of Technology, Pasadena, Calif., USA

    Paul E. Dimotakis

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  1. Paul E. Dimotakis
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Editor information

Editors and Affiliations

  1. Department of Theoretical and Applied Mechanics, University of Illinois at Urbana-Champaign, USA

    Hassan Aref  & James W. Phillips  & 

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© 2001 Kluwer Academic Publishers

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Dimotakis, P.E. (2001). Recent Advances in Turbulent Mixing. In: Aref, H., Phillips, J.W. (eds) Mechanics for a New Mellennium. Springer, Dordrecht. https://doi.org/10.1007/0-306-46956-1_21

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  • DOI: https://doi.org/10.1007/0-306-46956-1_21

  • Publisher Name: Springer, Dordrecht

  • Print ISBN: 978-0-7923-7156-4

  • Online ISBN: 978-0-306-46956-5

  • eBook Packages: Springer Book Archive

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