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Particle-laden viscous thin-film flows on an incline: Experiments compared with a theory based on shear-induced migration and particle settling
Authors:N MurisicJ Ho  V HuP Latterman  T KochK Lin  M MataAL Bertozzi
Institution:
  • a Mathematics Department, University of California, Los Angeles, CA 90095, USA
  • b Department of Chemical and Biomolecular Engineering, University of California, Los Angeles, CA 90095, USA
  • c Mechanical and Aerospace Engineering Department, University of California, Los Angeles, CA 90095, USA
  • d Department of Bioengineering, University of California, Los Angeles, CA 90095, USA
  • e Department of Physics, Harvey Mudd College, Claremont, CA 91711, USA
  • f Department of Mathematics, The University of Hong Kong, Pokfulam, Hong Kong
  • Abstract:Particle settling in driven viscous films is a complex physical process involving different physical effects. A recent analysis by Cook (2008) 10] has identified a balance between hindered settling and shear-induced migration as the dominant large scale physics for particle/liquid separation. However, experimental data for this has been lacking. This paper presents new data including the role of particle size and liquid viscosity showing clear agreement with the theory. We discuss the role of timescales in the dynamics of the experiment and present results from a dynamic model.
    Keywords:Thin films  Particle-laden flows  Fingering instability  Shear-induced migration
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