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Article
Rotating, Axial flow of a continously separating mixture.
| Authors: |
Dahlkild, A. A., Amberg, G.A. |
| Document Type: |
Article |
| Pubstate: |
Published |
| Journal: |
J. Fluid Mech. |
| Volume: |
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| Year: |
1993 |
AbstractRotational flow through narrow axial channels is considered in connection with a proposed technique to sort and separate particles according to sedimentation velocities. Nonlinear and linear axisymmetric flow through two channels connected by a slot in the vertical wall is studied numerically. A linearized formulation for the three-dimensional flow through a circumferentially blocked channel, with arbitrary positioning of the inlets and outlets, is examined analytically. Both approaches indicate that to have a sharp criteria for fractionation, the vertical shear layers on the channel walls must overlap. Otherwise, Coriolis effects, accompanying a strong azimuthal motion, make the sorting less precise. Results of an exploratory experiment with a simple two-stage machine demonstrate the feasibility of the basic press for simultaneous and continuous separation and fractionation.
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