Physics – Fluid Dynamics
Scientific paper
2008-06-20
Europhysics Letters 84 (2008) 44003
Physics
Fluid Dynamics
11 pages, 6 figures. submitted to PRL
Scientific paper
10.1209/0295-5075/84/44003
We present hydrokinetic Lattice Boltzmann and Molecular Dynamics simulations of capillary filling of high-wetting fluids in nano-channels, which provide clear evidence of the formation of thin precursor films, moving ahead of the main capillary front. The dynamics of the precursor films is found to obey the Lucas-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 both geometries under inspection. Both hydrokinetic and Molecular Dynamics approaches indicate a precursor film thickness of the order of one tenth of the capillary diameter. The quantitative agreement between the hydrokinetic and atomistic methods indicates that the formation and propagation of thin precursors can be handled at a mesoscopic/hydrokinetic level, thereby opening the possibility of using hydrokinetic methods to space-time scales and complex geometries of direct experimental relevance.
Biferale Luca
Binder Kurt
Chibbaro Sergio
Dimitrov Darko
Diotallevi Fabiana
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