Optimization of the membrane and pore design for micro-machined membranes

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Abstract

For micro-machined membranes, it is possible to choose pore size, pore geometry and membrane porosity, within certain limits. Different pore geometries (circular, square, slit shaped and triangular pores), particle size to pore size ratios, pore edges and membrane porosities were evaluated with lattice-Boltzmann computer simulations and torque balance considerations for various modes of operation. We focused on hydrodynamic interactions and assumed uncharged neutral surfaces of the particle and the pore. However, the model can easily be extended with additional relations for such interactions in practical systems with defined properties. It was concluded that pore geometry can have a large effect on the flux (up to 60%). Further, the effect of shielding could be quantified. Above a surface coverage of 0.05, the particles effectively shield each other from the flow field, therewith necessitating either a higher cross flow velocity or a lower transmembrane pressure for particle removal.
Original languageEnglish
Pages (from-to)239-250
JournalJournal of Membrane Science
Volume278
Issue number1-2
DOIs
Publication statusPublished - 2006

Keywords

  • cross-flow microfiltration
  • discretized boltzmann-equation
  • spacer-filled channels
  • ultrafiltration membranes
  • particulate suspensions
  • numerical simulations
  • pressure
  • flux
  • boundaries
  • spheres

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