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Molecular Dynamics Study of Lubrication Phenomena of Nanoscale Liquid Bridge between Surfaces

Abstract

When the lubricant supply is not sufficient to fill the gap between the solid surfaces in a lubricated contact, or when the wettability conditions are insufficient, the lubrication film can fractionate into disjointed liquid bridges. In these circumstances, surface tension of the liquid at the menisci and the behavior of mobile contact lines may strongly influence the friction between surfaces [1]. Especially, when the width of the liquid bridge is in the order of nanometers, such as in thin film or boundary lubrication regimes, the effect of the interfacial region cannot be disregarded. The phenomena occurring in a nanoscale liquid bridge must be analyzed from a microscopic point of view. Molecular dynamics (MD) is an effective tool for analyzing the molecular mechanisms of such nanoscale transport phenomena. From this point of view, we already observed the characteristics of lubrication phenomena of nanoscale liquid bridge without surfaces and it is found out that the momentum flux through the interfacial region is 1/4-1/3 of that through bulk region. In this paper, the momentum transport phenomena in a nanoscale liquid bridge between surfaces are simulated using MD method and the effect of surfaces, such as wettability, on the momentum transport phenomena of liquid bridge are analyzed in detail.

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hal-00863136 , version 1 (18-09-2013)

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  • HAL Id : hal-00863136 , version 1

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Takashi Tokumasu, Marie-Hélène Meurisse, Nicolas Fillot, Philippe Vergne. Molecular Dynamics Study of Lubrication Phenomena of Nanoscale Liquid Bridge between Surfaces. tribo-lyon2013 Conference, Sep 2013, Lyon, France. ⟨hal-00863136⟩
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