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Research Papers: Flows in Complex Systems

Discrete Particle Study of Turbulence Coupling in a Confined Jet Gas-Liquid Separator

[+] Author and Article Information
Wayne Strasser

 Eastman Chemical Company, P.O. Box 511, Building 54-D, Kingsport, TN 37662

J. Fluids Eng 130(1), 011101 (Dec 19, 2007) (11 pages) doi:10.1115/1.2816008 History: Received November 15, 2006; Revised August 07, 2007; Published December 19, 2007

A 3D computational fluid dynamics investigation of particle-induced flow effects and liquid entrainment from an industrial-scale separator has been carried out using the Eulerian–Lagrangian two-way coupled multiphase approach. A differential Reynolds stress model was used to predict the gas phase turbulence field. The dispersed (liquid) phase was present at an intermediate mass loading (0.25) but low volume fraction (0.05). A discrete random walk method was used to track the paths of the liquid droplet releases. It was found that gas phase deformation and turbulence fields were significantly impacted by the presence of the liquid phase; these effects have been parametrically quantified. Substantial enhancement of both the turbulence and the anisotropy of the continuous phase by the liquid phase was demonstrated. It was also found that a large number (1000) of independent liquid droplet release events were needed to make conclusions about liquid entrainment. Known plant run conditions and entrainment rates validated the numerical method.

Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Contours of velocity along radial slices for a preliminary 3D gas-only study. Red indicates the gas that has a velocity magnitude greater than the base particle slip velocity. The gray color marks the vessel walls.

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Figure 2

Typical carryover samples for coupled base particle size. The mean is ∼900ppm by weight.

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Figure 3

Typical instantaneous contours of particle concentration with and without feedback from particles of base diameter on a vessel center cut

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Figure 4

Typical instantaneous contours of turbulence viscosity ratio with and without feedback from particles of base diameter on a vessel center cut

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Figure 5

Typical instantaneous contours of production:dissipation ratio with and without feedback from particles of base diameter

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Figure 6

Typical instantaneous contours of turbulence intensity (normalized by superficial velocity) with and without feedback from particles of base diameter

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Figure 7

Planar average coupled:uncoupled ratios on axial slices showing turbulence viscosity ratio for three pairs of cases

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Figure 8

Planar average coupled:uncoupled ratios on axial slices showing turbulence production:dissipation for three pairs of cases

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Figure 9

Planar average coupled:uncoupled ratios on axial slices showing turbulence intensity (normalized by superficial velocity) for three pairs of cases

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Figure 10

Typical instantaneous contours of the first Reynolds stress anisotropy tensor parameter on a vessel center cut

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Figure 11

Typical instantaneous contours of the second Reynolds stress anisotropy tensor parameter on a vessel center cut

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Figure 12

Typical instantaneous contours of the Lumley triangle determinant on a vessel center cut

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Figure 13

Typical instantaneous contours of the normalized length on a vessel center cut

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Figure 14

Planar average coupled:uncoupled ratios on axial slices showing the normalized length of departure from isotropy (Eq. 13) for three pairs of cases

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Figure 15

Planar average coupled:uncoupled ratios on axial slices showing the NRAT determinant (Eq. 12) for three pairs of cases

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Figure 16

Azimuthally averaged coupled:uncoupled ratios on an axial slice at a distance of one jet diameter from the cone exit showing the normalized length of departure from isotropy and local turbulence intensity for the base diameter

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Figure 17

A Lumley-style plot at the same location as in Fig. 1.

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Figure 18

Typical instantaneous contours of Q on a vessel center cut

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Figure 19

Typical instantaneous contours of Δ on a vessel center cut

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Figure 20

Typical instantaneous contours of Δ on a plane at a distance of one jet diameter from the cone exit

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