Reduction of granular drag inspired by self-burrowing rotary seedsopen access
- Authors
- Jung, Wonjong; Choi, Sung Mok; Kim, Wonjung; Kim, Ho-Young
- Issue Date
- Apr-2017
- Publisher
- AMER INST PHYSICS
- Citation
- PHYSICS OF FLUIDS, v.29, no.4
- Journal Title
- PHYSICS OF FLUIDS
- Volume
- 29
- Number
- 4
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/87974
- DOI
- 10.1063/1.4979998
- ISSN
- 1070-6631
1089-7666
- Abstract
- We present quantitative measurements and mathematical analysis of the granular drag reduction by rotation, as motivated by the digging of Erodium and Pelargonium seeds. The seeds create a motion to dig into soil before germination using their moisture-responsive awns, which are originally helical shaped but reversibly deform to a linear configuration in a humid environment. We show that the rotation greatly lowers the resistance of soil against penetration because grain rearrangements near the intruder change the force chain network. We find a general correlation for the drag reduction by relative slip, leading to a mathematical model for the granular drag of a rotating intruder. In addition to shedding light on the mechanics of a rotating body in granular media, this work can guide us to design robots working in granular media with enhanced maneuverability. Published by AIP Publishing.
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