Roller Air Analyzers

This apparatus determined the particle size distribution of metal powders by suspension in a stream of air. Using this apparatus, a powder is classified into particle size fractions that range from 5 to 40 /' m. A stream of high-velocity air flowing through a nozzle of suitable size impinges the powder sample contained in a U-tube, so that the powder becomes dispersed within the stream. The velocity (v) of the air stream through the chamber balances the settling velocity of particles with diameter and density determined by a Stokes law calculation:

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