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Molecular kinetic modelling of nanoscale slip flow using a continuum approach

Published online by Cambridge University Press:  23 March 2022

Baochao Shan Open the ORCID record for Baochao Shan [Opens in a new window] ,
Peng Wang Open the ORCID record for Peng Wang [Opens in a new window] ,
Runxi Wang Open the ORCID record for Runxi Wang [Opens in a new window] ,
Yonghao Zhang Open the ORCID record for Yonghao Zhang [Opens in a new window]  and
Zhaoli Guo Open the ORCID record for Zhaoli Guo [Opens in a new window]
Baochao Shan
Affiliation:
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China
Peng Wang
Affiliation:
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China
Runxi Wang
Affiliation:
School of Engineering, The University of Edinburgh, Edinburgh EH9 3FB, UK
Yonghao Zhang*
Affiliation:
School of Engineering, The University of Edinburgh, Edinburgh EH9 3FB, UK
Zhaoli Guo*
Affiliation:
State Key Laboratory of Coal Combustion, Huazhong University of Science and Technology, Wuhan 430074, PR China
*
†Email addresses for correspondence: [email protected]; [email protected]
†Email addresses for correspondence: [email protected]; [email protected]
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Abstract

One major challenge for a continuum model to describe nanoscale confined fluid flows is the lack of a boundary condition that can capture molecular-scale slip behaviours. In this work, we propose a molecular-kinetic boundary condition to model the fluid–surface and fluid–fluid molecular interactions using the Lennard–Jones type potentials, and add a mean-field force to the momentum equation. This new boundary condition is then applied to investigate the nanoscale Couette and Poiseuille flows using the generalised hydrodynamic model developed by Guo et al. (Phys. Fluids, volume 18, issue 6, 2006a, 067107). The accuracy of our model is validated by molecular dynamics simulations and other models for a broad range of parameters including density, shear rate, wettability and channel width. Our simulation results reveal some unexpected and unintuitive slip behaviours at the nanoscale, including the epitaxial layering structure of fluids and the slip length minimum. The slip length minimum, which is analogous to the Knudsen minimum, can be explained by competing fluid–solid and fluid–fluid molecular interactions as density varies. A new scaling law is proposed for the slip length to account for not only the competing effect between the fluid–solid and fluid–fluid molecular interactions, but also many other physical mechanisms including the competition between the fluid internal potential energy and kinetic energy, and the confinement effect. While the slip length is nearly constant at the low shear rates, it increases rapidly at the high shear rates due to friction reduction. These molecular-scale slip behaviours are caused by energy corrugations at the fluid–solid interface where strong fluid–solid and fluid–fluid molecular interactions interplay.

JFM classification

Rarefied Gas Flow: Kinetic theory Rarefied Gas Flow: Molecular dynamics
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 939 , 25 May 2022 , A9
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Copyright
© The Author(s), 2022. Published by Cambridge University Press

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References

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