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Turbulent Flow and Dispersion of Inertial Particles in a Confined Jet Issued by a Long Cylindrical Pipe

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Abstract

In this work we examine first the flow field of a confined jet produced by a turbulent flow in a long cylindrical pipe issuing in an abrupt angle diffuser. Second, we examine the dispersion of inertial micro-particles entrained by the turbulent flow. Specifically, we examine how the particle dispersion field evolves in the multiscale flow generated by the interactions between the large-scale structures, which are geometry dependent, with the smaller turbulent scales issued by the pipe which are advected downstream. We use Large-Eddy-Simulation (LES) for the flow field and Lagrangian tracking for particle dispersion. The complex shape of the domain is modelled using the immersed-boundaries method. Fully developed turbulence inlet conditions are derived from an independent LES of a spatially periodic cylindrical pipe flow. The flow field is analyzed in terms of local velocity signals to determine spatial coherence and decay rate of the coherent K–H vortices and to make quantitative comparisons with experimental data on free jets. Particle dispersion is analyzed in terms of statistical quantities and also with reference to the dynamics of the coherent structures. Results show that the particle dynamics is initially dominated by the Kelvin–Helmholtz (K–H) rolls which form at the expansion and only eventually by the advected smaller turbulence scales.

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Author notes

  1. Alfredo Soldati

    Present address: EPFL, Lausanne (CH), Switzerland

Authors and Affiliations

  1. Centro Interdipartimentale di Fluidodinamica e Idraulica, and Dipartimento di Energetica e Macchine, Università di Udine, 33100, Udine, Italy

    Fabio Sbrizzai & Alfredo Soldati

  2. Dipartimento di Ingegneria Meccanica e Gestionale and Centre of Excellence for Computational Mechanics (CEMeC), Politecnico di Bari, 70125, Bari, Italy

    Roberto Verzicco

  3. Department of Fluid Mechanics, CISM, 33100, Udine, Italy

    Alfredo Soldati

Authors
  1. Fabio Sbrizzai
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  2. Roberto Verzicco
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  3. Alfredo Soldati
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Corresponding authors

Correspondence to Roberto Verzicco or Alfredo Soldati.

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Sbrizzai, F., Verzicco, R. & Soldati, A. Turbulent Flow and Dispersion of Inertial Particles in a Confined Jet Issued by a Long Cylindrical Pipe. Flow Turbulence Combust 82, 1–23 (2009). https://doi.org/10.1007/s10494-008-9163-1

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  • DOI: https://doi.org/10.1007/s10494-008-9163-1

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