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We present hydrokinetic Lattice Boltzmann and Molecular Dynamics simulationsof capillary filling of high-wetting fluids in nano-channels, which provideclear evidence of the formation of thin precursor films, moving ahead of themain capillary front. The dynamics of the precursor films is found to obey theLucas-Washburn law as the main capillary front, z2(t) proportional to t,although with a larger prefactor, which we find to take the same value for bothgeometries under inspection. Both hydrokinetic and Molecular Dynamicsapproaches indicate a precursor film thickness of the order of one tenth of thecapillary diameter. The quantitative agreement between the hydrokinetic andatomistic methods indicates that the formation and propagation of thinprecursors can be handled at a mesoscopic/hydrokinetic level, thereby openingthe possibility of using hydrokinetic methods to space-time scales and complexgeometries of direct experimental relevance.

Evidence of thin-film precursors formation in hydrokinetic and atomistic simulations of nano-channel capillary filling