Abstract
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 language | English |
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Pages (from-to) | 775-790 |
Number of pages | 16 |
Journal | International Journal of Multiphase Flow |
Volume | 32 |
Issue number | 7 |
DOIs | |
State | Published - Jul 2006 |
Externally published | Yes |
Keywords
- Free-surface flow
- Particle image velocimetry
- Shear-induced corrugation
- Suspension