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Oshitani J, Sasaki T, Tsuji T, et al. Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds. Phys Rev Lett. 2016;116(6):068001doi: 10.1103/PhysRevLett.116.068001.
Oshitani, J., Sasaki, T., Tsuji, T., Higashida, K., & Chan, D. Y. (2016). Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds. Physical review letters, 116(6), 068001. https://doi.org/10.1103/PhysRevLett.116.068001
Oshitani, Jun, et al. "Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds." Physical review letters vol. 116,6 (2016): 068001. doi: https://doi.org/10.1103/PhysRevLett.116.068001
Oshitani J, Sasaki T, Tsuji T, Higashida K, Chan DY. Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds. Phys Rev Lett. 2016 Feb 12;116(6):068001. doi: 10.1103/PhysRevLett.116.068001. Epub 2016 Feb 11. PMID: 26919013.
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Phys Rev Lett. 2016 Feb 12;116(6):068001. doi: 10.1103/PhysRevLett.116.068001. Epub 2016 Feb 11.

Anomalous Sinking of Spheres due to Local Fluidization of Apparently Fixed Powder Beds.

Physical review letters

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

Affiliations

  1. Department of Applied Chemistry, Okayama University, Okayama 700-8530, Japan.
  2. Department of Mechanical Engineering, Osaka University, 2-1 Yamadaoka Suita, Osaka 565-0871, Japan.
  3. School of Mathematics and Statistics, University of Melbourne, Parkville 3010, Australia.
  4. Department of Chemistry and Biotechnology, Swinburne University of Technology, Hawthorn 3122, Australia.

PMID: 26919013 DOI: 10.1103/PhysRevLett.116.068001

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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