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| Coagulation effects of submicroscopic vortices |
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Abstract Velocity field data were acquired for Taylor-Couette flow in the annulus gap between a rotating inner cylinder and a fixed concentric outer cylinder by using particle image velocimetry (PIV).The vortices of submicroscopic size were produced in the annulus gap according to the velocity vector map. The flocculation efficiencies were also obtained in the same Taylor-Couette flow under the conditions corresponding to the different vortices. The flocculation efficiencies reached the maximum values (above 50%) in the wavy vortex flow(WVF)range due to the closed vortices and their contractions and expansions with time, but out of WVF range, the comparatively low flocculation efficiencies were obtained due to the no-closed vortices connected with each other.
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Received: 08 June 2011
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