K.-J. Hwang and Y.-C. Shie (Taiwan)
Simulation, centrifugal filtration, particle migration, particle size distribution
Particle migration and cake formation in a centrifugal filter basket under various rotating speeds are simulated using a Lagrangian-Eulerian model. The velocities and trajectories of particle in the filter basket are analyzed based on the Newton’s second law of motion and the hindered settling theory. The variations of the interfaces between clear liquid, suspension and filter cake during a filtration are then simulated. The simulated results of particle concentration profiles in the filter basket show that a uniform concentration exists in the middle region of the filter basket during the centrifugal filtration with a low rotating speed. The sedimentation effect of particles may result in a heterogeneous filter cake. More larger particles deposit in the region near the filter medium, while finer particles deposit near the cake surface. An increase in the rotating speed leads to a more heterogeneous cake. The effect of rotating speed on the particle size distribution in cake is also discussed.
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