Drag anisotropy of cylindrical solids in fluid-saturated granular beds
Drag anisotropy of cylindrical solids in fluid-saturated granular beds
复制标题
流体饱和颗粒床中圆柱形固体的阻力各向异性
DOI:
10.1103/physrevfluids.6.124302
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发表时间:
2021
影响因子:
2.7
通讯作者:
Kudrolli, Arshad
中科院分区:
文献类型:
--
作者:
Pal, Ankush;Kudrolli, Arshad
We study the direction-dependent drag acting on a cylindrical solid intruder with lengthand diameteras it moves in water-saturated granular beds at constant depth. Polysterene and hydrogel grains with diameterare used to investigate materials which have high contact friction and those which are nearly frictionless, respectively. The drag on the intruder is measured while oriented perpendicularand parallelto its axis as a function of speedfrom the quasistatic to the rate-dependent regime. We find that the drag anisotropyis not constant and increases significantly with driving rate andin both mediums. In particular for,increases from 2.6 to 4.5, and from 7.0 to 8.2 in the high- and low-friction beds, respectively, as the nondimensional Froude numberis varied betweenand. On average,is observed to increase logarithmically withfor. Exploiting the index-matched nature of hydrogel grains in water, we further show that the sediment flow around the cylinder in the two orientations is consistent with skin friction–dominated drag. The relative contributions of the cylindrical side and the circular flat-ends onare estimated with thin disks to understand the observed variation of drag with aspect ratio and surface friction.
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DOI:
10.1073/pnas.1911317116
发表时间:
2019-12-17
影响因子:
11.1
作者:
Kudrolli, Arshad;Ramirez, Bernny
通讯作者:
Ramirez, Bernny
影响因子:
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作者:
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影响因子:
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作者:
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通讯作者:
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DOI:
10.1098/rspa.2009.0445
发表时间:
2010-04-08
影响因子:
3.5
作者:
Mueller, S.;Llewellin, E. W.;Mader, H. M.
通讯作者:
Mader, H. M.
影响因子:
2.7
作者:
T. Hossain;P. Rognon
通讯作者:
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