Gas-cyclones are widely used in separation or size classification
apparatus for gas–solid flows because of their simple structure and low
cost. Recently,with improvements in the dimensions of various parts of
cyclones, a fairly high level of precision in the classification of submicron
order particles has become possible[1–3]. Recent industrial
requirements of ceramics or metal powders require particle size
distributions with a narrow standard deviation, because the physical
properties of such classified particles are related to the performance of
electrical, magnetic and chemical reactions. In particular, particles with
a diameter of 0.1 to 1 μm are required for various powder handling
processes. In order to classify a particle cut size in the size range of 0.1 to
1 μm, forced centrifugal classifiers are not always effective because of
particle erosion problems and the increased maintenance costs of such
classifiers due to high revolutions
Gas-cyclones are widely used in separation or size classificationapparatus for gas–solid flows because of their simple structure and lowcost. Recently,with improvements in the dimensions of various parts ofcyclones, a fairly high level of precision in the classification of submicronorder particles has become possible[1–3]. Recent industrialrequirements of ceramics or metal powders require particle sizedistributions with a narrow standard deviation, because the physicalproperties of such classified particles are related to the performance ofelectrical, magnetic and chemical reactions. In particular, particles witha diameter of 0.1 to 1 μm are required for various powder handlingprocesses. In order to classify a particle cut size in the size range of 0.1 to1 μm, forced centrifugal classifiers are not always effective because ofparticle erosion problems and the increased maintenance costs of suchclassifiers due to high revolutions
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