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Relaxation of thermal capillary waves for nanoscale liquid films on anisotropic-slip substrates
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Zhang, Yixin, Lockerby, Duncan A. and Sprittles, James E. (2021) Relaxation of thermal capillary waves for nanoscale liquid films on anisotropic-slip substrates. Langmuir, 37 (29). pp. 8667-8676. doi:10.1021/acs.langmuir.1c00352 ISSN 0743-7463.
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WRAP-Relaxation-thermal-capillary-waves-nanoscale-liquid-films-anisotropic-slip-substrates-2021.pdf - Accepted Version - Requires a PDF viewer. Download (8Mb) | Preview |
Official URL: http://dx.doi.org/10.1021/acs.langmuir.1c00352
Abstract
The relaxation dynamics of thermal capillary waves for nanoscale liquid films on anisotropic-slip substrates are investigated using both molecular dynamics (MD) simulations and a Langevin model. The anisotropy of slip on substrates is achieved using a specific lattice plane of a face-centered cubic lattice. This surface’s anisotropy breaks the simple scalar proportionality between slip velocity and wall shear stress and requires the introduction of a slip-coefficient tensor. The Langevin equation can describe both the growth of capillary wave spectra and the relaxation of capillary wave correlations, with the former providing a time scale for the surface to reach thermal equilibrium. Temporal correlations of interfacial Fourier modes, measured at thermal equilibrium in MD, demonstrate that (i) larger slip lengths lead to a faster decay in wave correlations and (ii) unlike isotropic-slip substrates, the time correlations of waves on anisotropic-slip substrates are wave-direction-dependent. These findings emerge naturally from the proposed Langevin equation, which becomes wave-direction-dependent, agrees well with MD results, and allows us to produce experimentally verifiable predictions.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QC Physics Q Science > QP Physiology T Technology > TA Engineering (General). Civil engineering (General) T Technology > TJ Mechanical engineering and machinery |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > Engineering Faculty of Science, Engineering and Medicine > Science > Mathematics |
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| Library of Congress Subject Headings (LCSH): | Nanofluidics, Microfluidics , Fluid mechanics -- Mathematical models, Liquid films -- Mathematical models, Molecular dynamics | |||||||||||||||
| Journal or Publication Title: | Langmuir | |||||||||||||||
| Publisher: | American Chemical Society | |||||||||||||||
| ISSN: | 0743-7463 | |||||||||||||||
| Official Date: | 27 July 2021 | |||||||||||||||
| Dates: |
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| Volume: | 37 | |||||||||||||||
| Number: | 29 | |||||||||||||||
| Page Range: | pp. 8667-8676 | |||||||||||||||
| DOI: | 10.1021/acs.langmuir.1c00352 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Reuse Statement (publisher, data, author rights): | “This document is the Accepted Manuscript version of a Published Work that appeared in final form in Langmuir, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see [insert ACS Articles on Request author-directed link to Published Work, see http://pubs.acs.org/page/policy/articlesonrequest/index.html].” | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| Date of first compliant deposit: | 16 August 2021 | |||||||||||||||
| Date of first compliant Open Access: | 12 July 2022 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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