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Classification of Fine Particles in High‐Speed Centrifuges
Author(s) -
Spelter L. E.,
Nirschl H.
Publication year - 2010
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201000089
Subject(s) - centrifuge , rotational speed , polystyrene , particle size , fraction (chemistry) , particle (ecology) , volume (thermodynamics) , volume fraction , materials science , centrifugal force , mechanics , work (physics) , flow (mathematics) , chromatography , chemistry , composite material , chemical engineering , physics , mechanical engineering , engineering , geology , thermodynamics , oceanography , nuclear physics , polymer
The classification of dispersed particles below 1 μm is a difficult task due to the high surface area‐to‐volume ratio. Tubular‐bowl centrifuges offer high centrifugal numbers, which enable the separation and classification of fine particles, biological cells and cell debris. This work presents the classification of two fine products with a mean particle size below 1 μm. Polydisperse silica and polystyrene were split successfully into a fine and a coarse fraction by a semi‐continuous tubular‐bowl centrifuge. The fine fractions exhibited narrow particle size distributions. An optimization of the process could be achieved by a comprehensive understanding of the flow patterns, which are accessible with computational fluid dynamics. The axial and tangential velocity profiles were calculated for rotational speeds up to 40,000 rpm and throughputs ranging from 0.1 to 2 L/min.