Abstract
The theoretical impaction efficiency curves for round and rectangular impactors are approximately the same when plotted as a function of modified Stokes number, defined as the ratio of aerodynamic stopping distance to impact distance I, where I is the distance from the impact surface to the point at which the free streamline, emanating from the jet orifice, has deflected from a straight line by 5–10% relative to the half-width of the throat. This distance is also equal to half the hydraulic diameter of the throat. Experiments confirm the prediction when tested under the conditions of the numerical model. However, lateral flow entrance into a cascade stage and impaction onto glass fiber paper may change the impaction efficiency considerably, resulting in a shift of the impaction efficiency curve with respect to Stokes number and in a considerable decrease in the sharpness of cut.
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