Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds
Jun Oshitani1, Toshiki Sasaki1, Takuya Tsuji2
1Department of Applied Chemistry, Okayama University, Okayama 700-8530, Japan.
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.
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