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The effect of gravity and dimensionality on the impact of cylinders and spheres onto a wall in a viscous fluid

Cornell Affiliated Author(s)

Author

A.E. Yacoubi
S. Xu
Z.J. Wang

Abstract

As a solid body approaches a wall in a viscous fluid, the flow in the gap between them is dominated by the viscous effect and can be approximated by the lubrication theory. Here we show that without gravity, a cylinder comes to rest asymptotically at a finite separation from the wall, whereas with gravity, the cylinder approaches the wall asymptotically and contact does not happen in finite time. A cylinder approaches the wall much slower compared to a sphere under matching conditions, implying that the lubrication approximates hold longer before the molecular scale sets in. Our results further serve as a building block for analyzing particle interactions in close proximity, and provide analytic results for integrating the lubrication theory into the computations of Navier-Stokes equations. © Published by AIP Publishing.

Date Published

Journal

Physics of Fluids

Volume

29

Issue

2

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85013392837&doi=10.1063%2f1.4974519&partnerID=40&md5=3ee9ef284675045e6448539e83127818

DOI

10.1063/1.4974519

Group (Lab)

Z. Jane Wang Group

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