Free-surface flow of concentrated suspensions

Anugrah Singh, Avinoam Nir*, Raphael Semiat

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Free-surface flows of concentrated suspensions exhibit many interesting phenomena such as particle segregation and surface corrugation. In this work the flow structures associated with free-surface has been studied experimentally. The free-surface velocity for neutrally buoyant suspension of uniform spheres in a gravity driven inclined channel flow was determined by particle imaging velocimetry (PIV) technique. Experiments were carried out for concentrated suspensions with particle fractions φ{symbol} ranging from 0.40 to 0.50. The measured velocities show blunted profile in the channel. The blunting of the velocity profile increases with the particle concentration. The rms velocity fluctuations measured at the free-surface progressively increase with particle fraction φ{symbol} and are linear in shear rate γ. The surface roughness were characterized by analyzing the power spectral density of the refracted light from the free-surface. The characteristics observed are in support of earlier findings.

Original languageEnglish
Pages (from-to)775-790
Number of pages16
JournalInternational Journal of Multiphase Flow
Issue number7
StatePublished - Jul 2006
Externally publishedYes


  • Free-surface flow
  • Particle image velocimetry
  • Shear-induced corrugation
  • Suspension

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