Multiphase water flow inside carbon nanotubes

E.M. Kotsalis, Jens Honore Walther, P- Koumoutsakos

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We present nonequilibrium molecular dynamics simulations of the flow of liquid–vapour water mixtures and mixtures of water and nitrogen inside carbon nanotubes. A new adaptive forcing scheme is proposed to impose a mean flow through the system. The flow of liquid water is characterised by a distinct layering of the water molecules in the vicinity of the boundary and a slip length that is found to increase with the radius of the carbon nanotube. Increasing the temperature and pressure of the system furthermore results in a decrease in the slip length. For the flow of mixtures of nitrogen and water we find that the slip length is reduced as compared to the slip for the pure water. The shorter slip length is attributed to the fact that nitrogen forms ddroplets at the carbon surface, thus partially shielding the bulk flow from the hydrophobic carbon surface.
Keyword: Slip length,Carbon nanotubes,Water–nitrogen mixture,Confined fluid,Multiphase flow
Original languageEnglish
JournalInternational Journal of Multiphase Flow
Volume30
Pages (from-to)995-1010
ISSN0301-9322
DOIs
Publication statusPublished - 2004
Externally publishedYes

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