Hydrokinetic simulations of nanoscopic precursor films in rough channels

Details Hydrokinetic simulations of nanoscopic precursor films in rough channels Hydrokinetic simulations of nanoscopic precursor films in rough channels

2009-01-06

arxiv.org/abs/0901.0677v2

Jour. Stat. Mech. : Theory and expermients (2009) P06007

Physics

Fluid Dynamics

16 pages, 8 figures; To be published on JSTAT: Journal of statistical mechanics: Theory and experiments

Scientific paper

We report on simulations of capillary filling of high-wetting fluids in nano-channels with and without obstacles. We use atomistic (molecular dynamics) and hydrokinetic (lattice-Boltzmann) approaches which point out 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 a square-root law as the main capillary front, z^2(t) ~ t, although with a larger prefactor, which we find to take the same value for the different geometries (2D-3D) under inspection. The two methods show a quantitative agreement which indicates that the formation and propagation of thin precursors can be handled at a mesoscopic/hydrokinetic level. This can be considered as a validation of the Lattice-Boltzmann (LB) method and opens the possibility of using hydrokinetic methods to explore space-time scales and complex geometries of direct experimental relevance. Then, LB approach is used to study the fluid behaviour in a nano-channel when the precursor film encounters a square obstacle. A complete parametric analysis is performed which suggests that thin-film precursors may have an important influence on the efficiency of nanochannel-coating strategies.

Affiliated with

Also associated with

No associations

Rating

Hydrokinetic simulations of nanoscopic precursor films in rough channels does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Hydrokinetic simulations of nanoscopic precursor films in rough channels, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydrokinetic simulations of nanoscopic precursor films in rough channels will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-632720