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TECHNICAL PAPERS

Numerical Simulations of Flows Inside a Partially Filled Centrifuge

[+] Author and Article Information
Fang Yan, Bakhtier Farouk

Department of Mechanical Engineering, Drexel University, Philadelphia, PA 19104

J. Fluids Eng 125(6), 1033-1042 (Jan 12, 2004) (10 pages) doi:10.1115/1.1627832 History: Received March 20, 2002; Revised July 03, 2003; Online January 12, 2004
Copyright © 2003 by ASME
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References

Figures

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Computed radial profiles of (a) axial (b) and relative azimuthal velocity at z/H=0.438 in the liquid region for the overrotating case
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Computed radial profiles of (a) axial and relative azimuthal velocity at z/H=0.83 in the liquid region for the overrotating case
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Computed radial profiles of (a) axial and (b) relative azimuthal velocity at z/H=0.438 in gas and liquid phases for the overrotating case (the dashed line indicates the free surface)
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Computed radial profiles of axial (a) and azimuthal (b) velocity at z/H=0.83 in gas and liquid phases for the overrotating case (the dashed line indicates the free surface)
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(a) Streamlines in the gas region for the overrotating case (the dashed line on the right indicates the free surface); (b) details of streamlines near the top end in the air flow region for the overrotating case (the dashed line on the right indicates the free surface)
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Streamlines in the liquid region for the overrotating case (the vertical left side indicates the free surface) (the stream function values along each stream lines in the figure are equally distributed between 1×10−6 and 6×10−6)
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Nonuniform grid generated for the overrotating case
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The effect of mesh size on axial velocity profile at z/H=0.438 in the liquid region for the “overrotating” lid case (the origin of the horizontal axis indicates the free surface)
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Streamlines at time Ωt=400 for the spinup case
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(a) Streamlines at time Ωt=200 for the spinup case; (b) details of streamlines near the bottom end at time Ωt=200 for the spinup case
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The effect of time-step sizes on the numerical results at instant Ωt=400
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The effect of mesh sizes on the numerical results at nondimensional time, Ωt=400; (a) development of free surface, (b) radial velocity along the r direction at section z=0.25 mm
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Comparison of the predicted steady free-surface shape with analytic solution
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Comparison of the transient free-surface shapes for the spinup case, –, experimental data; [[dashed_line]], numerical results
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(a) Schematic diagram of the spinup problem, (b) schematic diagram of the “overrotating” lid problem

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