Slip coefficient in nanoscale pore flow

Sokhan, V. P.; Quirke, N.

doi:10.1103/physreve.78.015301

Cited by 39 publications

(52 citation statements)

References 27 publications

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“…3 in Ref. [20] found peak in the water-flow rate that are located in the [17][18][19][20][21][22][23]Å range which deviates from the experiment where the peak is around 13Å. Notice that, we found that for large channel heights (H> 30Å), the well-known contribution of capillary pressure dominates in Eq.…”

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confidence: 74%

Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water

Neek-Amal

Lohrasebi

Mousaei

et al. 2018

Applied Physics Letters

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Water inside a nanocapillary becomes ordered, resulting in unconventional behavior. A profound enhancement of water flow inside nanometer thin capillaries made of graphene has been observed [B. Radha et.al., Nature (London) 538, 222 (2016)]. Here we explain this enhancement as due to the large density and the extraordinary viscosity of water inside the graphene nanocapillaries. Using the Hagen-Poiseuille theory with slippage-boundary condition and incorporating disjoining pressure term in combination with results from molecular dynamics (MD) simulations, we present an analytical theory that elucidates the origin of the enhancement of water flow inside hydrophobic nanocapillaries. Our work reveals a distinctive dependence of water flow in a nanocapillary on the structural properties of nanoconfined water in agreement with experiment, which opens a new avenue in nanofluidics.

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contrasting

confidence: 74%

Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water

Neek-Amal

Lohrasebi

Mousaei

et al. 2018

Applied Physics Letters

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“…However, the enhancement data are widely scattered, 6-17 hence, the formulation of a precise BC is a subject of great interest and significant challenge in nanofluidic research. [18][19][20][21][22][23][24][25][26][27] In the steady state, the fluid shear stress σ xy must be continuous across the channel. Navier 28 proposed the first slip BC by relating this shear stress to the fluid slip velocity u s at the wall via the fluid-solid interfacial friction coefficient ξ 0 ,…”

Section: Introductionmentioning

confidence: 99%

Interfacial slip friction at a fluid-solid cylindrical boundary

Kannam

Todd

Hansen

et al. 2012

The Journal of Chemical Physics

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Recently we proposed a method to calculate the interfacial friction coefficient between fluid and solid at a planar interface. In this work we extend the method to cylindrical systems where the friction coefficient is curvature dependent. We apply the method to methane flow in carbon nanotubes, and find good agreement with non-equilibrium molecular dynamics simulations. The proposed method is robust, general, and can be used to predict the slip for cylindrical nanofluidic systems.

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“…It had been also reported that the slip length on a rough surface decreased as the roughness increasing in the rough-wall nanochannel flow, 16,33 and Yang further pointed out that the presence of surface roughness always suppresses the slip length of fluid past the wall of nanochannels whatever the surface is hydrophilic or hydrophobic. 32 Moreover, Sokhan and Quirke found the slip length dependent sufficiently on the pore size and keeping a constant for pore size larger than 20σ, 50 which differs from the linear prediction by Maxwell slip theory. According to the mass flux shown in Fig.…”

Section: B Velocity Profiles and Slip Lengthmentioning

confidence: 94%

Nanochannel flow past permeable walls via molecular dynamics

Xie

Cao

2016

AIP Advances

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The nanochannel flow past permeable walls with nanopores is investigated by molecular dynamics (MD) simulations, including the density distribution, velocity field, molecular penetration mechanism and surface friction coefficient. A low density distribution has been found at the gas-wall interface demonstrating the low pressure region. In addition, there exists a jump of the gas density on the permeable surface, which indicates the discontinuity of the density distribution across the permeable surface. On the other hand, the nanoscale vortices are observed in nanopores of the permeable wall, and the reduced mass flux of the flow in nanopores results in a shifted hydrodynamic boundary above the permeable surface. Particularly the slip length of the gas flow on the permeable surface is pronounced a non-linear function of the molecular mean free path, which produces a large value of the tangential momentum accommodation coefficient (TMAC) and a big portion of the diffusive refection. Moreover, the gas-gas interaction and multi-collision among gas molecules may take place in nanopores, which contribute to large values of TMAC. Consequently the boundary friction coefficient on the permeable surface is increased because of the energy dissipation consumed by the nanoscale vortices in nanopores. The molecular boundary condition provides us with a new picture of the nanochannel flow past the permeable wall with nanopores.

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Slip coefficient in nanoscale pore flow

Cited by 39 publications

References 27 publications

Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water

Fast water flow through graphene nanocapillaries: A continuum model approach involving the microscopic structure of confined water

Interfacial slip friction at a fluid-solid cylindrical boundary

Nanochannel flow past permeable walls via molecular dynamics

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