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| Title: Hydrokinetic simulations of nanoscopic precursor films in rough channels |
| Authors: |
| Author Full Names: Chibbaro, S.; Biferale, L.; Binder, K.; Dimitrov, D.; Diotallevi, F.; Milchev, A.; Succi, S. |
| Source: JOURNAL OF STATISTICAL MECHANICS-THEORY AND EXPERIMENT : Art. No. P06007 JUN 2009 |
| Language: English |
| Document Type: Article |
| Author Keywords: microfluidics and nanofluidics (theory); lattice Boltzmann methods; molecular dynamics |
| KeyWords Plus: DISSIPATIVE PARTICLE DYNAMICS; LIQUID FLOW; CAPILLARY; MICROCHANNELS; SURFACES; FRICTION |
| Abstract: We report on simulations of capillary filling of highly wetting fluids in nanochannels with and without obstacles. We use atomistic (molecular dynamics) and hydrokinetic (lattice Boltzmann; LB) approaches which indicate 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 like that obeyed by the main capillary front, z(2)(t) alpha 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 LB method and opens the possibility of using hydrokinetic methods to explore space-time scales and complex geometries of direct experimental relevance. Then, the LB approach is used to study the fl! uid behaviour in a nanochannel 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. |
| Reprint Address: Chibbaro, S, Univ Tor Vergata, Dept Mech Engn, Via Politecn 1, I-00133 Rome, Italy. |
| Research Institution addresses: [Chibbaro, S.] Univ Tor Vergata, Dept Mech Engn, I-00133 Rome, Italy; [Biferale, L.] Univ Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy; [Biferale, L.] Univ Tor Vergata, Ist Nazl Fis Nucl, I-00133 Rome, Italy; [Binder, K.; Milchev, A.] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany; [Dimitrov, D.] Univ Food Technol, Plovdiv 4000, Bulgaria; [Diotallevi, F.; Succi, S.] CNR, Ist Applicaz Calcolo, I-00161 Rome, Italy |
| E-mail Address: sergio.chibbaro@gmail.com; biferale@roma2.infn.it; Kurt.Binder@uni-mainz.de; dimitro@uni-mainz.de; f.diotallevi@iac.cnr.it; milchev@mail.uni-mainz.de; succi@iac.cnr.it |
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| Cited Reference Count: 51 |
| Times Cited: 0 |
| Publisher: IOP PUBLISHING LTD; DIRAC HOUSE, TEMPLE BACK, BRISTOL BS1 6BE, ENGLAND |
| Subject Category: Mechanics; Physics, Mathematical |
| ISSN: 1742-5468 |
| DOI: 10.1088/1742-5468/2009/06/P06007 |
| IDS Number: 459UZ |
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