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Agitated medium dense slurries in a dead-end filtration geometry

Koenders, MA; Koenders, C (Kingston)
Monday 05 January 2009, 12:35-13:00

Seminar Room 1, Newton Institute


In a dead-end filtration set-up a constant mean fluid flow is maintained. The slurry is agitated by vibrating the permeable septum at the bottom of the geometry. The agitation causes a particle pressure which expands the slurry, thus keeping the septum clear. Experimentally it is shown that a steady-state solidosity profile is created. To describe this experiment the McTigue-Jenkins granular temperature theory is used. This is the only particle-fluid model that takes explicit account of fluctuations and therefore can handle situations in which there is no mean overall motion of the slurry. The many parameters of the theory are derived from a cell model in a mean-field approximation, which is validated/justified to some extent by verification against viscosity data. The model employs the lubrication interaction for rough particles. The set-up has many practical applications, but it is also beneficial for the understanding of medium dense slurry flow (by medium dense it is meant that no enduring contacts form in the slurry, so say, solidosity less than 0.6 and greater than 0.3).


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