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research article

Thin Liquid Film Dynamics on a Spinning Spheroid

Duruk, Selin
•
Boujo, Edouard  
•
Sellier, Mathieu
September 1, 2021
Fluids

The present work explores the impact of rotation on the dynamics of a thin liquid layer deposited on a spheroid (bi-axial ellipsoid) rotating around its vertical axis. An evolution equation based on the lubrication approximation was derived, which takes into account the combined effects of the non-uniform curvature, capillarity, gravity, and rotation. This approximate model was solved numerically, and the results were compared favorably with solutions of the full Navier-Stokes equations. A key advantage of the lubrication approximation is the solution time, which was shown to be at least one order of magnitude shorter than for the full Navier-Stokes equations, revealing the prospect of controlling film dynamics for coating applications. The thin film dynamics were investigated for a wide range of geometric, kinematic, and material parameters. The model showed that, in contrast to the purely gravity-driven case, in which the fluid drains downwards and accumulates at the south pole, rotation leads to a migration of the maximum film thickness towards the equator, where the centrifugal force is the strongest.

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Type
research article
DOI
10.3390/fluids6090318
Web of Science ID

WOS:000699733700001

Author(s)
Duruk, Selin
Boujo, Edouard  
Sellier, Mathieu
Date Issued

2021-09-01

Publisher

MDPI

Published in
Fluids
Volume

6

Issue

9

Start page

318

Subjects

Physics, Fluids & Plasmas

•

Physics

•

thin liquid film

•

nonlinear dynamics

•

external forcing

•

curved substrate

•

coating

•

coating flows

•

driven flow

•

fluid

•

model

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LFMI  
Available on Infoscience
October 9, 2021
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/181956
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