Boundary slip as a result of a prewetting transition

Details Boundary slip as a result of a prewetting transition Boundary slip as a result of a prewetting transition

2003-06-12

arxiv.org/abs/cond-mat/0306345v2

J. Chem. Phys., 119, p. 13106, 2003

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1063/1.1627751

Some fluids exhibit anomalously low friction when flowing against a certain solid wall. To recover the viscosity of a bulk fluid, slip at the wall is usually postulated. On a macroscopic level, a large slip length can be explained as a formation of a film of gas or phase-separated `lubricant' with lower viscosity between the fluid and the solid wall. Here we justify such an assumption in terms of a prewetting transition. In our model the thin-thick film transition together with the viscosity contrast gives rise to large boundary slip. The calculated value of the slip length has a jump at the prewetting transition temperature which depends on the strength of the fluid-surface interaction (contact angle). Furthermore, the temperature dependence of the slip length is non-monotonous.

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