Abstract
Air velocity distribution and pressure loss in a centrifugal air classifier were investigated. First, theoretical equations for air velocity and pressure difference were derived from the Navier-Stokes equation, and these were compared with observed data. Although a fair agreement between the observed and calculated values was obtained in air velocity, a great difference was found in pressure difference. A reason for the later was the dissipation energy Ev of vortex air with high speed. Also, 0.05-0.1m2/s of eddy diffusivity for momentum was observed.A simple method for estimating Ev was experimentaly found to follow the form:Ev=0.44|ΔU|2 where ΔU is the air velocity difference at the classifier.When a powder was induced into the classifier, additional pressure loss by powder was not affected by the feed rate of the powder and was kept at a constant value depending on the properties of powder, such as powder density and particle size, and on the conditions of the classifier, such as rotor speed and airflow rate.
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