CONTINUOUS FRACTIONATION OF GLASS MICROSPHERES BY GRAVITATIONAL SEDIMENTATION IN SPLIT-FLOW THIN (SPLITT) CELLS
- 1 July 1991
- journal article
- research article
- Published by Taylor & Francis in Particulate Science and Technology
- Vol. 9 (3-4) , 105-118
- https://doi.org/10.1080/02726359108906584
Abstract
Split-flow thin (SPLITT) separation cells, consisting of submillimeter thick rectangular channels having now splitters at both inlet and outlet ends, were operated continuously using the earth's gravitational field as a driving force to prepare narrow fractions from polydisperse micron-size glass bead populations. Equations arc shown that make it possible to achieve a binary fractionation around a specified cutoff particle diameter by the control of inlet and outlet flowrates. Using a single separation cell, each narrow fraction was obtained by a two step fractionation. one dividing the panicle population around the upper desired limit and the other around the lower desired limit of particle diameters. The clean fractionation by SPLITT cell operation was verified by scanning electron microscopy, which also provided the mean particle diameter and the coefficient of variation for each fraction. The consistency of size distribution results was also examined by steric field-flow fractionation.Keywords
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