Die Beschreibung der Partikelabscheidung durch Trägheitskräfte mit Hilfe einer dimensionsanalytisch abgeleiteten Kennzahl

Abstract

Abstract Description of particle precipitation by inertial forces by means of a group derived by dimensional analysis . The fractional degree of precipitation depends upon many operating parameters: these can be attributed to three independent dimensionless groups: the Stokes, the Reynolds, and the Euler number. On the basis of extensive experimental material, dimensional analysis shows that, for sufficiently large Reynolds numbers and in a large range of the Euler number, the inertial precipitation depends upon a single dimensionless group, the precipitation parameter Ψ A . It can be regarded as the ratio of two energies, viz. a characteristic precipitation energy, expressed as the product of the inertial energy of the particle and the pressure drop coefficient of the precipitators, and a frictional energy dissipated in the boundary surface of the impact body. Thus inertial precipitation is transformed from a complicated flow problem into an energetic problem in which pressure drop plays a major role. Simple approximation formulae can be given for the fractional degree of precipitation and the limiting droplet size for all types of separators.