open access

https://hdl.handle.net/2115/48407

Particle-like and fluid-like settling of a stratified suspension

英語

Reyleigh-Taylor Instability

2012-01

Springer

The European physical journal. E, Soft matter and biological physics

35

1

The gravitational settling of inhomogeneously suspended particles in a fluid has been investigated. Of particular interest is whether collective or individual motion of particles is dominant during their settlings, i.e., whether the particles settle as a continuous suspension or they settle individually relative to the surrounding fluid. We observed the settling of a stratified suspension which has the lower and upper concentration interfaces in a quasi-two-dimensional vessel. In some cases, the suspension behaves perfectly as a continuous fluid and the motion of the constituent particle is subject to bulk flow caused by the interfacial instability. In other cases, the particle behaves individually relative to the surrounding fluid. The existence of a concentration interface plays a significant role in these extreme behaviors of suspension. The transition from the collective to individual behaviors can be predicted quantitatively by a parameter which expresses the border resolution of the concentration interface.

学術雑誌論文

Accepted Manuscript

The original publication is available at www.eurphysj.org

1292-8941

AA11469024