Issue 16, 2020

Rotation of a submerged finite cylinder moving down a soft incline

Abstract

A submerged finite cylinder moving under its own weight along a soft incline lifts off and slides at a steady velocity while also spinning. Here, we experimentally quantify the steady spinning of the cylinder and show theoretically that it is due to a combination of an elastohydrodynamic torque generated by flow in the variable gap, and the viscous friction on the edges of the finite-length cylinder. The relative influence of the latter depends on the aspect ratio of the cylinder, the angle of the incline, and the deformability of the substrate, which we express in terms of a single scaled compliance parameter. By independently varying these quantities, we show that our experimental results are consistent with a transition from an edge-effect dominated regime for short cylinders to a gap-dominated elastohydrodynamic regime when the cylinder is very long.

Graphical abstract: Rotation of a submerged finite cylinder moving down a soft incline

Supplementary files

Article information

Article type
Paper
Submitted
27 Nov 2019
Accepted
21 Mar 2020
First published
30 Mar 2020

Soft Matter, 2020,16, 4000-4007

Author version available

Rotation of a submerged finite cylinder moving down a soft incline

B. Saintyves, B. Rallabandi, T. Jules, J. Ault, T. Salez, C. Schönecker, H. A. Stone and L. Mahadevan, Soft Matter, 2020, 16, 4000 DOI: 10.1039/C9SM02344E

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