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Design parameters for rotating cylindrical filtrationRotating cylindrical filtration displays significantly reduced plugging of filter pores and build-up of a cake layer, but the number and range of parameters that can be adjusted complicates the design of these devices. Twelve individual parameters were investigated experimentally by measuring the build-up of particles on the rotating cylindrical filter after a fixed time of operation. The build-up of particles on the filter depends on the rotational speed, the radial filtrate flow, the particle size and the gap width. Other parameters, such as suspension concentration and total flow rate are less important. Of the four mechanisms present in rotating filters to reduce pore plugging and cake build-up, axial shear, rotational shear, centrifugal sedimentation and vortical motion, the evidence suggests rotational shear is the dominant mechanism, although the other mechanisms still play minor roles. The ratio of the shear force acting parallel to the filter surface on a particle to the Stokes drag acting normal to the filter surface on the particle due to the difference between particle motion and filtrate flow can be used as a non-dimensional parameter that predicts the degree of particle build-up on the filter surface for a wide variety of filtration conditions. c2002 Elsevier Science B.V. All rights reserved.
Document ID
20040088109
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Schwille, John A.
(Northwestern University Evanston, IL 60208, United States)
Mitra, Deepanjan
Lueptow, Richard M.
Date Acquired
August 21, 2013
Publication Date
July 15, 2002
Publication Information
Publication: Journal of membrane science
Volume: 204
Issue: 2-Jan
ISSN: 0376-7388
Subject Category
Life Sciences (General)
Funding Number(s)
CONTRACT_GRANT: NAG9-1053
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Life Support Systems

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