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Inertial separation of particles

The particle Reynolds number based on maximum terminal velocity in air (maximum slip velocity of particles suspended in air) can be estimated by [Pg.26]

It is noted that the particles classified by cascade impactors are typically less than 50 pm in size and of material density less than 3000 kg/m3. With this upper limit, the Rep is 0.6 which is within the Stokes regime. Thus, in the applications of cascade impactors, the terminal velocity is determined by [Pg.27]

The inertial separation due to the sudden change of the direction of a particle-laden flow stream is characterized by the particle stopping distance. This is defined as the travelling distance of a particle in its forward direction before coming to rest with respect to the surrounding fluid. With Stokes drag, the particle stopping distance of a spherical particle with initial velocity U0 can be calculated as [Pg.27]

FIGURE 2.12 Simple single-stage impactor (Hinds, 1982). [Pg.28]

It is noted that, when the flow goes though this right-angle impaction, only those particles whose initial flow streamline are within this total departure distance away from the collection plate will be collected by the plate. Hence, the collection efficiency is the ratio of the total departure distance to the flow tube size which is the half of the impactor opening, i.e., [Pg.29]


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