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Deformation and dewetting of liquid films under gas jets

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journal contribution
posted on 02.11.2020, 16:50 authored by Juliet Ojiako, Radu Cimpeanu, Hemaka BandulasenaHemaka Bandulasena, Roger SmithRoger Smith, Dmitri TseluikoDmitri Tseluiko
We study the deformation and dewetting of liquid films under impinging gas jets using experimental, analytical and numerical techniques. We first derive a reduced-order model (a thin-film equation) based on the long-wave assumption and on appropriate decoupling of the gas problem from that for the liquid. The model not only provides insight into relevant flow regimes, but is also used in conjunction with experimental data to guide more computationally prohibitive direct numerical simulations of the full governing equations. A unique feature of our modelling solution is the use of an efficient iterative procedure in order to update the interfacial deformation based on stresses originating from computational data. We show that both gas normal and tangential stresses are equally important for achieving accurate predictions. The interplay between these techniques allows us to study previously unreported flow features. These include finite-size effects of the host geometry, with consequences for flow and vortex formation inside the liquid, as well as the specific individual contributions from the non-trivial gas flow components on interfacial deformation. Dewetting phenomena are found to depend on either a dominant gas flow or contact line motion, with the observed behaviour (including healing effects) being explained using a bifurcation diagram of steady-state solutions in the absence of the gas flow.

Funding

UK Fluids Network

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering
  • Science

Department

  • Chemical Engineering
  • Mathematical Sciences

Published in

Journal of Fluid Mechanics

Volume

905

Publisher

Cambridge University Press

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Cambridge University Press under the Creative Commons Attribution 4.0 International Licence (CC BY 4.0). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

01/09/2020

Publication date

2020-10-27

Copyright date

2020

ISSN

0022-1120

eISSN

1469-7645

Language

en

Depositor

Prof Roger Smith. Deposit date: 29 October 2020

Article number

A18

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