Suspension separation with deterministic ratchets at moderate Reynolds numbers

Y.S. Lubbersen, M.A.I. Schutyser, R.M. Boom

Research output: Contribution to journalArticleAcademicpeer-review

33 Citations (Scopus)


Deterministicratchets were evaluated in this study as continuous separation devices for suspensions. Compared to conventional microfluidic ratchets (gap width ˜10 µm), ratchet designs in this study were 70 times larger. Apart from the hydrodynamic regime (21), which lead to additional displacement. Furthermore, there was a maximum concentration of particles in the device above which the separation decreased, e.g., 12 v/v% for a design with cylindrical-shaped obstacles. The high suspension concentrations did not lead to blockage of the device and were much higher compared to concentrations normally achieved for membrane separations. The up-scaled deterministicratchets show potential for fractionation. Particles above a critical particle size were better separated than particles below that critical particle size.
Original languageEnglish
Pages (from-to)314-320
JournalChemical Engineering Science
Publication statusPublished - 2012


  • lateral displacement
  • fractionation
  • arrays

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