The transition in the sedimentation pattern of a particle cloud

Y. Noh, H. J.S. Fernando

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)


Experiments were carried out to study the sedimentation of a two-dimensional particle cloud. When a large number of particles (glass beads) of uniform size are released from a two-dimensional opening into a column of fresh water, the mixture initially descends as a thermal; however, after some time, the particles start settling individually, thus leaving the parent fluid behind. For a given type of particle, the critical depth zc at which this transition occurs, measured from a virtual origin, was found to change as zcws/v∼(Q/vws)α, with α≅0.3, where ws is the terminal velocity of a single particle, v is the kinematic viscosity, and Q is the total buoyancy of the released particles per unit length. The descending velocity and the spatial growth of the particle cloud were found to depend on its sedimentation characteristics.

Original languageEnglish
Pages (from-to)3049-3055
Number of pages7
JournalPhysics of Fluids A
Issue number12
Publication statusPublished - 1992

All Science Journal Classification (ASJC) codes

  • Engineering(all)


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