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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.