Capillary dynamic under nanoconfinement: Coupling the energy dissipation of contact line and confined water

•The increased viscosity of confined water is investigated by considering the energy barrier induced by pore wall.•A unified model is proposed to accurately predict the dynamic capillary filling in nanopores.•The mechanism for the friction discrepancy between TPCL and nanoconfined water is revealed....

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Bibliographic Details
Published in:International journal of heat and mass transfer 2018-12, Vol.127, p.329-338
Main Authors: Feng, Dong, Li, Xiangfang, Wu, Keliu, Li, Jing, Zhao, Wen
Format: Article
Language:English
Subjects:
Computer simulation
Contact angle
Coupling (molecular)
Dynamic capillary filling
Energy dissipation
Flow resistance
Friction
Imbibition
Kinetic theory
Molecular dynamics
Nanoconfined water
Nanopores
Pore size
Porosity
Silica
Silicon dioxide
Three-phase contact line
Water flow
Water resistance
Wettability
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Summary:•The increased viscosity of confined water is investigated by considering the energy barrier induced by pore wall.•A unified model is proposed to accurately predict the dynamic capillary filling in nanopores.•The mechanism for the friction discrepancy between TPCL and nanoconfined water is revealed.•The friction induced by TPCL and nanoconfined water are compared. Understanding the dynamic imbibition behaviors through nanopores is a subject of great interest in many fields. Recent molecular dynamics (MD) simulations and pressure-driven experiments demonstrated the increased flow resistance of nanoconfined water, which proposed a challenge to the classical molecular kinetic theory (MKT) that the friction dissipation mainly occurs at the three-phase contact line (TPCL) during the dynamic imbibition process. To address this issue, a unified model that combines the friction of moving contact line and confined water behind the meniscus is proposed to capture the dynamic imbibition behaviors at the nanoscale. The model is successfully validated against the published literatures. The results demonstrate that (1) the friction of confined water in hydrophilic silica nanopores (
ISSN:0017-9310
1879-2189
DOI:10.1016/j.ijheatmasstransfer.2018.07.114