Physics of nanoscale immiscible fluid displacement
Name
PhysRevFluids.4.124203.pdf
Description
Published version
Size
1.3 MB
Format
Adobe PDF
Checksum (MD5)
3a252c8490d63873fb59eba9be645cf3
Author(s)
Wang, Gerald J
Damone, Angelo
Benfenati, Francesco
Poesio, Pietro
Beretta, Gian Paolo
Hadjiconstantinou, Nicolas G
Date Issued
2019
Journal
Physical Review Fluids
Publisher
American Physical Society (APS)
Version
Final published version
Abstract
© 2019 American Physical Society. We investigate immiscible fluid displacement at small scales where slip lengths are on the order of characteristic system sizes, whereby Cox's law is not expected to be valid. Molecular dynamics simulations show that in this limit hydrodynamic bending becomes small and interfaces remain approximately spherical. In this case the only relevant angle for describing the interface shape is the dynamic microscopic angle at the fluid-solid interface. In our simulations, this angle is found to be described well by the molecular-kinetic theory originally proposed by Blake and Haynes. In general, this implies a different functional dependence between the contact angle (and related quantities) and the flow speed (or capillary number); this is demonstrated for the case of the force on the boundary for immiscible fluid displacement in a two-dimensional channel.
MIT Department
Massachusetts Institute of Technology. Department of Mechanical Engineering
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1103/PHYSREVFLUIDS.4.124203
