Cyclones.
The most common type of dust collector used is the cyclone, where dust and particles along with air enter a cylindrical or conical space tangentially at one or more points and exit through a central opening. It is a construction without moving parts where the gas stream is carried into a confined vortex where centrifugal forces tend to drive the particles to the walls of the cyclone. The particles, due to their inertia, tend to move towards the walls.
The cyclone will be used as the basis for the vortex description. The gas entering the inlet near the top of the cylindrical body creates a vortex or spiral flow between the outlet walls of the gas stream and the cyclone body. This vortex is called the main vortex and coming from a certain point and then, near the base of the cone, it changes direction but maintains its rotational motion. Thus a second vortex is driven up towards the gas outlet.
High efficiency cyclones can act as final separators with up to 90 % retention.

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