Improvement the Performance of Liquid Purification by Dynamic Rotary Filters

Liquids purification from solid mechanical admixtures is a topical problem in many technical applications. Promising way to improve the performance and to reduce the cost of purification is using the dynamic filtration principle on the base of rotating filter element. This principle is known to be successfully utilized in thin membrane filtration applications. Wide use of rotational filtration in liquid systems of vehicles and industrial equipment requires theoretical study for larger rotational and filtration rates as well as consideration of porous baffle with lesser hydraulic resistance. The numerical approach is elaborated for simulation of liquid phase motion in a rotary filter with a porous filtering cylinder and support framework. The vortical flow motion in the gap is detected to be a factor leading to significant local increase of filtration velocity and even to exclusion the part of filtering surface from operation. The modeling approach for particle motion study in the stable flow outside of rotating porous cylinder is substantiated. The possibility is demonstrated in deterministic consideration to prevent under definite conditions contact of particles with the filtering surface. It is also shown that maximum influence of centrifugal force on the suspended particle motion can be achieved when particles are an order of magnitude less the boundary layer thickness.