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Physics of Fluids / Volume 24 / Issue 1 / ARTICLES / Particulate, Multiphase, and Granular Flows

Phys. Fluids 24, 013301 (2012); http://dx.doi.org/10.1063/1.3673610 (14 pages)

Particulate mixing in a turbulent serpentine duct

X. Huang and P. A. Durbin

Department of Aerospace Engineering, Iowa State University, Ames, Iowa 50011, USA

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(Received 25 May 2011; accepted 1 December 2011; published online 4 January 2012)

Direct numerical simulations of particles in a serpentine duct were conducted at bulk flow Stokes numbers between 0.125 and 6. The geometrical curvature causes particles to depart direction from the mean flow. Above a Stokes number of about unity, a reflection layer forms along the outer curve of the bend. Reflectional mixing creates regions of nearly uniform particle mean velocity and kinetic energy. Particles leave the inner bend in a plume that separates from the inner wall at low Stokes number. At higher Stokes number, the plume splits in two, adding an upper part consisting of ballistic particles, that do not follow the geometrical curvature. When the Stokes number is low, the instantaneous 3-D distribution of particles visualizes wall streaks. But at higher Stokes number, particles disperse out of the reflection layer and form large scale puffs in the central portion of the duct.

© 2012 American Institute of Physics

Article Outline

  1. INTRODUCTION
  2. COMPUTATIONAL APPROACH
  3. ILLUSTRATION OF A REFLECTION LAYER
  4. SERPENTINE CHANNEL
    1. Distribution and concentration
    2. Velocities
  5. THREE-DIMENSIONAL STRUCTURE
  6. DISCUSSION

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KEYWORDS and PACS

Keywords

boundary layer turbulence, flow separation, flow simulation, mixing, numerical analysis, pipe flow

PACS

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3673610

PUBLICATION DATA

ISSN

1070-6631 (print)  
1089-7666 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    G. M. Laskowski and P. A. Durbin, “Direct numerical simulations of turbulent flow through a stationary and rotating infinite serpentine passage,” Phys. Fluids 19, 015101 (2007)PHFLE6000019000001015101000001.

    Q. Wang and K. D. Squires, “Large eddy simulation of particle laden turbulent channel flow,” Phys. Fluids 8, 1207 (1996)PHFLE6000008000005001207000001.


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