dorsal/arxiv
View SchemaLattice Boltzmann simulations of apparent slip in hydrophobic microchannels
| Authors | Jens Harting, Christian Kunert, Hans J. Herrmann |
|---|---|
| Categories | |
| ArXiv ID | physics/0509035 |
| URL | https://arxiv.org/abs/physics/0509035 |
| DOI | 10.1209/epl/i2006-10107-8 |
| Journal | Europhysics Letters 75, 328-334 (2006) |
Abstract
Various experiments have found a boundary slip in hydrophobic microchannel flows, but a consistent understanding of the results is still lacking. While Molecular Dynamics (MD) simulations cannot reach the low shear rates and large system sizes of the experiments, it is often impossible to resolve the needed details with macroscopic approaches. We model the interaction between hydrophobic channel walls and a fluid by means of a multi-phase lattice Boltzmann model. Our mesoscopic approach overcomes the limitations of MD simulations and can reach the small flow velocities of known experiments. We reproduce results from experiments at small Knudsen numbers and other simulations, namely an increase of slip with increasing liquid-solid interactions, the slip being independent of the flow velocity, and a decreasing slip with increasing bulk pressure. Within our model we develop a semi-analytic approximation of the dependence of the slip on the pressure.
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"abstract": "Various experiments have found a boundary slip in hydrophobic microchannel\nflows, but a consistent understanding of the results is still lacking. While\nMolecular Dynamics (MD) simulations cannot reach the low shear rates and large\nsystem sizes of the experiments, it is often impossible to resolve the needed\ndetails with macroscopic approaches. We model the interaction between\nhydrophobic channel walls and a fluid by means of a multi-phase lattice\nBoltzmann model. Our mesoscopic approach overcomes the limitations of MD\nsimulations and can reach the small flow velocities of known experiments. We\nreproduce results from experiments at small Knudsen numbers and other\nsimulations, namely an increase of slip with increasing liquid-solid\ninteractions, the slip being independent of the flow velocity, and a decreasing\nslip with increasing bulk pressure. Within our model we develop a semi-analytic\napproximation of the dependence of the slip on the pressure.",
"arxiv_id": "physics/0509035",
"authors": [
"Jens Harting",
"Christian Kunert",
"Hans J. Herrmann"
],
"categories": [
"physics.flu-dyn",
"cond-mat.mtrl-sci",
"physics.comp-ph"
],
"doi": "10.1209/epl/i2006-10107-8",
"journal_ref": "Europhysics Letters 75, 328-334 (2006)",
"title": "Lattice Boltzmann simulations of apparent slip in hydrophobic microchannels",
"url": "https://arxiv.org/abs/physics/0509035"
},
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