Design parameters for rotating cylindrical filtration

John A. Schwille, Deepanjan Mitra, Richard M. Lueptow*

*Corresponding author for this work

Research output: Contribution to journalArticle

27 Scopus citations

Abstract

Rotating 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.

Original languageEnglish (US)
Pages (from-to)53-65
Number of pages13
JournalJournal of Membrane Science
Volume204
Issue number1-2
DOIs
StatePublished - Jul 15 2002

Keywords

  • Dynamic filtration
  • Fouling
  • Microfiltration

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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