Fast nanofluidics by travelling surface waves

Xie, Jianfei; Cao, Bing‐Yang

doi:10.1007/s10404-017-1946-z

Cited by 12 publications

(4 citation statements)

References 56 publications

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“…4 . Cao et al studied the flow of fluid inside nanochannel in the presence of travelling surface waves and confirmed that the velocity increases with the increasing of amplitude and frequency [ 45 ], which is also in accordance to the parametric analysis.…”

Section: Resultssupporting

confidence: 59%

The speed-locking effect of particles on a graphene layer with travelling surface wave

Wang

2020

Nanoscale Res Lett

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Fast diffusion induced by thermal fluctuation and vibration has been detected at nanoscales. In this paper, the movement of particle on a graphene layer with travelling surface wave is studied by molecular dynamics simulation and theoretical model. It is proved that the particle will keep moving at the wave speed with certain prerequisite conditions, namely speed-locking effect. By expressing van der Waals (vdW) potential between particle and wavy surface as a function of curvatures, the mechanism is clarified based on the puddle of potential in a relative wave-frame coordinate. Two prerequisite conditions are proposed: the initial position of particle should locate in the potential puddle, and the initial kinetic energy cannot drive particle to jump out of the potential puddle. The parametric analysis indicates that the speed-locking region will be affected by wavelength, amplitude and pair potential between particle and wave. With smaller wavelength, larger amplitude and stronger vdW potential, the speed-locking region is larger. This work reveals a new kind of coherent movement for particles on layered material based on the puddle potential theory, which can be an explanation for fast diffusion phenomena at nano scales.

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Section: Resultssupporting

confidence: 59%

The speed-locking effect of particles on a graphene layer with travelling surface wave

Wang

2020

Nanoscale Res Lett

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“…In the present study, the monatomic gas argon (Ar) molecules are used. The molecules move according to Newton's second law, and the intermolecular interactions between molecules are modelled through the Lennard-Jones (LJ) potential [31,32]:…”

Section: Direct Evaluationmentioning

confidence: 99%

A mean free path approach to the micro/nanochannel gas flows

Xie

2020

Adv. Aerodyn.

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We investigate the gas flows near to solid surfaces in terms of the local spatial variation in the molecular mean free path (MFP). Molecular dynamics (MD) is the appropriate scientific tool for obtaining molecularly-accurate dynamic information in micro and nano-scale gas flows, and has been used to evaluate the molecular mean free path of gases. In the calibration procedure, the viscosity of a gas in the homogeneous case can be recovered in our MD simulations and reach good agreement with the theoretical prediction and data from NIST. In surface-bounded gas flows, if the collisions between gas molecules and walls are counted, a spatially-varying mean free path is presented, and for the first time we have observed that the distribution of the free paths deviates from the exponential one and spikes appear in their distributions at larger Kn, i.e. in the transition flow regime. Based on elementary kinetic theory, the effective viscosity of the gas derived from the mean free path has been incorporated into the framework of the continuum-fluid dynamics equations, and micro-Couette flows are performed to demonstrate this potential application.

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“…Platinum atoms form two planes of a face-centred cubic (FCC) lattice, i.e. four layers of solid wall atoms, and are tethered to the lattice site with a harmonic spring which vibrates at the Einstein frequency 10,42 . A velocity rescaling thermostat is applied to all wall molecules at the same temperature as the gas throughout the MD simulations.…”

Section: B Molecular Dynamicsmentioning

confidence: 99%

Effective mean free path and viscosity of confined gases

et al. 2019

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The molecular mean free path (MFP) of gases in confined geometries is numerically evaluated by means of the direct simulation Monte Carlo (DSMC) method and molecular dynamics (MD) simulations. Our results show that if calculations take into account not only intermolecular interactions between gas molecules, but also collisions between gas molecules and wall atoms, then a space-dependent MFP is obtained. The latter, in turn, permits one to define an effective viscosity of confined gases that also varies spatially. Both the gas MFP and viscosity variation in surface-confined systems have been questioned in the past. In this work we demonstrate that this effective viscosity derived from our MFP calculations is consistent with those deduced from the linear-response relationship between the shear stress and strain rate using independent non-equilibrium Couette-style simulations, as well as the equilibrium Green-Kubo predictions.

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Fast nanofluidics by travelling surface waves

Cited by 12 publications

References 56 publications

The speed-locking effect of particles on a graphene layer with travelling surface wave

The speed-locking effect of particles on a graphene layer with travelling surface wave

A mean free path approach to the micro/nanochannel gas flows

Effective mean free path and viscosity of confined gases

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