Journal ArticleDOI
Fluid viscosity under confined conditions
V. Ya. Rudyak,A. A. Belkin +1 more
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In this paper, it is shown that the fluid viscosity is not determined by the fluid properties alone, but becomes a property of the fluid-nanochannel walls system as a whole.Abstract:
Closed equations of fluid transfer in confined conditions are constructed in this study using ab initio methods of nonequilibrium statistical mechanics. It is shown that the fluid viscosity is not determined by the fluid properties alone, but becomes a property of the “fluid-nanochannel walls” system as a whole. Relations for the tensor of stresses and the interphase force, which specifies the exchange by momentum of fluid molecules with the channel-wall molecules, are derived. It is shown that the coefficient of viscosity is now determined by the sum of three contributions. The first contribution coincides with the expression for the coefficient of the viscosity of fluid in the bulk being specified by the interaction of fluid molecules with each other. The second contribution has the same structure as the first one but is determined by the interaction of fluid molecules with the channel-wall molecules. Finally, the third contribution has no analog in the usual statistical mechanics of transport processes of a simple fluid. It is associated with the correlation of intermolecular forces of the fluid and the channel walls. Thus, it is established that the coefficient of viscosity of fluid in sufficiently small channels will substantially differ from its bulk value.read more
Citations
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Journal ArticleDOI
Rheology of Water Flows Confined between Multilayer Graphene Walls.
TL;DR: A validated all-atom non-equilibrium molecular dynamics model is used to simultaneously analyse continuum transport and atomistic structure properties of water in a slit between two moving graphene walls under Couette flow conditions and it is shown that under the sub-nanometer confinement, water loses its rotational symmetry of a Newtonian fluid.
Journal ArticleDOI
Molecular dynamics simulation of fluid viscosity in nanochannels
V. Rudyak,A. Belkin +1 more
TL;DR: In this article, the authors used a molecular dynamics (MD) method to calculate the viscosity of fluids in a plane nanochannel (nanoslit) and study the factors that determine the fluid viscoity.
Proceedings ArticleDOI
Fluid viscosity in nanochannels
V. Ya. Rudyak,A. A. Belkin +1 more
TL;DR: In this paper, the viscosity of fluids in a nanochannel between flat plates has been investigated by molecular dynamics method and it has been determined using the previously derived from the nonequilibrium statistical theory fluctuation-dissipation theorem.
Journal ArticleDOI
Viscosity of Gases in Nanochannels
V. Ya. Rudyak,E. V. Lezhnev +1 more
TL;DR: In this paper, the viscosity of a rarefied gas in nanochannels under normal conditions is studied, where the authors use the stochastic molecular method to calculate the visco-temperature and channel height.
Book ChapterDOI
Atomistic Modeling and Simulation for Solving Gas Extraction Problems
TL;DR: A model of two-phase gas filtration through porous media that can reproduce the jamming of wells is developed and diffusivity of hydrogen molecules demonstrates anomalous behavior on nanosecond timescale.
References
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Journal ArticleDOI
Nonequilibrium Statistical Thermodynamics
TL;DR: In this article, the state of the art of nonequilibrium statistical thermodynamics from a single viewpoint is examined for physicists and physical chemists working in the fields of theoretical physics, molecular physics, physical chemistry, and chemical physics.
Nonequilibrium statistical thermodynamics
TL;DR: In this paper, the state of the art of nonequilibrium statistical thermodynamics from a single viewpoint is examined for physicists and physical chemists working in the fields of theoretical physics, molecular physics, physical chemistry, and chemical physics.
Journal ArticleDOI
About Fluids Structure in Microchannels
TL;DR: In this article, a new MD algorithm is developed to simulate plane flow with a pressure drop along the channel and the dependence of the hydraulic flow resistance on the fluid structure is studied.
Journal ArticleDOI
Self-Diffusion Coefficient of Molecular Fluid in Porous Media
TL;DR: In this paper, the authors deal with the molecular-dynamics simulation of the self-diffusion of fluid molecules in porous media using the hard-sphere potential, and a study is made of the velocity autocorrelation functions of the molecules and dependences of selfdiffusion coefficient on the pore sizes, po-rosity, fluid density, and adsorption time.
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