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Research Papers: Flows in Complex Systems

Mass Loading Effects on Turbulence Modulation by Particle Clustering in Dilute and Moderately Dilute Channel Flows

[+] Author and Article Information
Jesse Capecelatro

Coordinated Science Laboratory,
University of Illinois at Urbana-Champaign,
Urbana, IL 61801
e-mail: jcaps@illinois.edu

Olivier Desjardins

Sibley School of Mechanical and
Aerospace Engineering,
Cornell University,
Ithaca, NY 14853-7501
e-mail: olivier.desjardins@cornell.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received December 8, 2014; final manuscript received May 10, 2015; published online June 24, 2015. Assoc. Editor: Francine Battaglia.

J. Fluids Eng 137(11), 111102 (Nov 01, 2015) (8 pages) Paper No: FE-14-1734; doi: 10.1115/1.4030644 History: Received December 08, 2014; Revised May 10, 2015; Online June 24, 2015

Wall-bounded particle-laden flows exhibit a variety of interesting phenomena that can greatly impact the underlying carrier-phase turbulence in practical systems. This work aims at investigating the effects of particle clustering on the carrier-phase turbulence in both dilute and moderately dilute channel flows via highly resolved Euler–Lagrange simulations. It is shown that the fluid turbulence departs significantly from the initially fully developed turbulent flow at moderate concentrations. In particular, the gas velocity retains a viscous sublayer at higher values of mass loading, but displays a strongly reduced boundary layer thickness and a flatter velocity profile compared to the dilute case. Furthermore, the flow orientation with respect to gravity is found to significantly impact the multiphase dynamics. Particles showed a preference to be in the near-wall region with significant volume fraction fluctuations when gravity opposed the mean flow direction, while particles accumulated at the channel center with less significant volume fraction fluctuations for flows with gravity aligned with the mean flow direction.

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References

Figures

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Fig. 1

Flow configuration: (a) channel dimensions and (b) near-wall mesh refinement. Grid spacing (horizontal lines) and corresponding particle size (circle).

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Fig. 2

Comparison of velocity statistics from single-phase channel flow with experiments normalized by the centerline velocity Ucl. Simulation results (—), Benson and Eaton [41] (•), and Paris [42] (⋄). (a) Mean streamwise velocity, (b) streamwise RMS velocity, and (c) vertical RMS velocity.

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Fig. 3

Velocity statistics from the dilute channel flow compared to experimental results. Simulation results: fluid phase (—) and particle phase (– –). Benson and Eaton [41]: fluid phase (•) and particle phase (∘). (a) Mean streamwise velocity, (b) streamwise RMS fluid velocity, and (c) streamwise RMS particle velocity.

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Fig. 4

PDF of streamwise particle-phase velocity from the dilute channel flow compared to experimental results. Simulation results: y/δ = 1 (—), 0 < y/δ < 0.1 (– –). Benson and Eaton [41]: y/δ = 1 (•), 0 < y/δ < 0.1 (∘).

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Fig. 5

Particle volume fraction statistics. Poisson distribution (dotted line), dilute (solid line), dense1 (dashed line), and dense2 (circles). (a) PDF of particle volume fraction, (b) mean particle-phase volume fraction, and (c) volume fraction fluctuations.

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Fig. 6

Instantaneous fluid-phase velocity magnitude for the particle-laden channel cases given in Table 1

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Fig. 7

Kinetic energy spectra at the channel center. κ−5∕3 (dotted line), unladen (thin solid line), dilute (thick solid line), dense1 (dashed line), and dense2 (circles).

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Fig. 8

Fluid and particle velocity profiles. uf+ = y+ depicting the viscous sublayer (dotted line), dilute (solid line), dense1 (dashed line), and dense2 (circles). (a) Mean streamwise fluid velocity, (b) streamwise RMS fluid velocity, (c) mean streamwise particle velocity, and (d) streamwise RMS particle velocity.

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Fig. 9

Volume fraction-fluid velocity covariance profiles. Dilute (solid line), dense1 (dashed line), and dense2 (circles). (a) Volume fraction streamwise velocity covariance and (b) volume fraction vertical velocity covariance.

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