Centrifugal filter for separating aerosol particles from a gas stream
Lawless, P., & Viner, AS. (1990). Centrifugal filter for separating aerosol particles from a gas stream. (U.S. Patent No. 4923491). http://patft.uspto.gov/netacgi/nph-Parser?patentnumber=4923491
A centrifugal filter for separating aerosol particles from a gas stream including a rotatable hollow hub and at least one pair of disks fixedly mounted in spaced apart relationship on the hub within a stationary housing mounted on the hub. The hub is perforated in the region between the two disks and is coupled to a vacuum pump so that the interior of the hub is at a lower pressure relative to the space between the disks. The hub is rotated, causing rotation of the disks. Aerosol particles in a flow gas are introduced between the disks and the housing at the periphery of the rotating disks. The pressure differential produced at the hub perforations draws the aerosol laden gas toward the hub. As the aerosol laden gas enters between the rotating disks and the housing, it experiences an acceleration to nearly the angular velocity of the disks, which results in a centrifugal force being applied to the aerosol particles in a direction opposite to the drag force exerted by the vacuum pump. The particles in the gas stream remain entrained in the outer periphery where they are removed, while the gas continues its motion toward the hub, thereby effecting separation.