Anomalous descent of intruders in vibrated gas-fluidized granular materials.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39972908.
- Also identified by DOI 10.1103/PhysRevE.111.L013403.
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Abstract
The descent of dense intruder disks through granular material fluidized by vertical gas flow and vibration is investigated experimentally and computationally. Single intruders descend with a velocity which oscillates based on distance above the bottom of the system, which simulations show is due to a spatially dependent void fraction in the granular material changing the effective drag force on the intruder. Two vertically aligned intruders undergo a drafting-kissing-tumbling analog which forms because the bottom intruder decelerates due to particle compaction from the weight of the top intruder.