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While designing filtering structure, which provides proper filtering parameters, we use the particle movement analysis in its flow through the filter, taking into account basic forces that drive the particle and cause its sediment on the filter element (those basic effects are: diffusion, inertia, sedimentation and electrostatic interaction).
fig. 2 Strucure of particles deposited on the fiber
The quality of the filter cartridge is determined by:
- Filtration efficiency,
- Pressure drop,
- Dirt capacity
The filtration efficiency is determined by the ratio,  , of particles filtered out and the number of particles entering the filter
where:
no – concentration of particles in the clean suspension
nk – concentration of particles after the filter
The other method of defining efficiency is the quotient  of concentration of particles before the filter to the number of particles after the filter:
The relation between those two parameters is decribed below:
Pressure drop of the suspension,  [bar], ]), flowing through the filter is determined by the difference of pressure of the suspention before and after the filter. .
The dirt capacity of the filter is determined by the mass of the dirt that the filter can stop during its work, till the moment when the pressure drop exceeeds the allowable size. |
