Anomalous sinking of spheres due to local fluidization of apparently fixed powder beds

Jun Oshitani, Toshiki Sasaki, Takuya Tsuji, Kyohei Higashida, Derek Y C Chan

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The sinking of an intruder sphere into a powder bed in the apparently fixed bed regime exhibits complex behavior in the sinking rate and the final depth when the sphere density is close to the powder bed density. Evidence is adduced that the intruder sphere locally fluidizes the apparently fixed powder bed, allowing the formation of voids and percolation bubbles that facilitates spheres to sink slower but deeper than expected. By adjusting the air injection rate and the sphere-to-powder bed density ratio, this phenomenon provides the basis of a sensitive large particle separation mechanism.

Original languageEnglish
Article number068001
JournalPhysical Review Letters
Volume116
Issue number6
DOIs
Publication statusPublished - Feb 11 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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