Physics of nanoscale immiscible fluid displacement

Wang, Gerald J.; Damone, Angelo; Benfenati, Francesco; Poesio, Pietro; Beretta, Gian Paolo; Hadjiconstantinou, Nicolas G.

doi:10.1103/physrevfluids.4.124203

Physics of nanoscale immiscible fluid displacement

Journal Article · Wed Dec 11 00:00:00 EST 2019 · Physical Review Fluids

DOI:https://doi.org/10.1103/physrevfluids.4.124203· OSTI ID:1800907

Wang, Gerald J. ^[1]; Damone, Angelo ^[2]; Benfenati, Francesco ^[3]; Poesio, Pietro ^[4]; Beretta, Gian Paolo ^[4]; Hadjiconstantinou, Nicolas G. ^[5]

Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); OSTI
Technische Universität Kaiserslautern (Germany); Università degli Studi di Brescia (Italy)
Technische Universität Kaiserslautern (Germany); Universitá degli Studi dell’Aquila (Italy)
Technische Universität Kaiserslautern (Germany)
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

In this work, 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.

View Accepted Manuscript (DOE)

Research Organization:: Krell Institute, Ames, IA (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: FG02-97ER25308

OSTI ID:: 1800907

Journal Information:: Physical Review Fluids, Journal Name: Physical Review Fluids Journal Issue: 12 Vol. 4; ISSN 2469-990X

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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