Effect of surface roughness on rate-dependent slip in simple fluids

Abstract

Molecular dynamics simulations are used to investigate the influence of molecular-scale surface roughness on the slip behavior in thin liquid films. The slip length increases almost linearly with the shear rate for atomically smooth rigid walls and incommensurate structures of the liquid/solid interface. The thermal fluctuations of the wall atoms lead to an effective surface roughness, which makes the slip length weakly dependent on the shear rate. With increasing the elastic stiffness of the wall, the surface roughness smoothes out and the strong rate dependence is restored again. Both periodically and randomly corrugated rigid surfaces reduce the slip length and its shear rate dependence.

15 pages, 5 figures; submitted to J. Chem. Phys

References in corpus (7)

• Boundary conditions at a fluid - solid interface
• Slip behavior in liquid films on surfaces of patterned wettability: Comparison between continuum and molecular dynamics simulations
• Influence of wetting properties on the hydrodynamic boundary condition at a fluid-solid interface
• Probing the nanohydrodynamics at liquid-solid interfaces using thermal motion
• Surface Roughness and Hydrodynamic Boundary Conditions
• Rate-dependent slip boundary conditions for simple fluids
• Molecular Dynamics Simulation of Solvent-Polymer Interdiffusion. I. Fickian diffusion

Cited by in corpus (20)

• Modeling the combined effect of surface roughness and shear rate on slip flow of simple fluids
• Molecular diffusion and slip boundary conditions at smooth surfaces with periodic and random nanoscale textures
• Shear rate threshold for the boundary slip in dense polymer films
• Slip boundary conditions for shear flow of polymer melts past atomically flat surfaces
• The relationship between induced fluid structure and boundary slip in nanoscale polymer films
• A Universal Molecular-Kinetic Scaling Relation for Slip of a Simple Fluid at a Solid Boundary
• Regularization of the slip length divergence in water nanoflows by inhomogeneities at the Angstrom scale
• Molecular dynamics simulations of oscillatory Couette flows with slip boundary conditions
• A unified slip boundary condition for flow over a surface
• Molecular dynamics simulations of the rotational and translational diffusion of a Janus rod-shaped nanoparticle
• Rheological study of polymer flow past rough surfaces with slip boundary conditions
• Diffusion of a Janus nanoparticle in an explicit solvent: A molecular dynamics simulation study
• Analysis of Boundary Slip in a Flow with an Oscillating Wall
• Interfacial friction between semiflexible polymers and crystalline surfaces
• Microscopic determination of macroscopic boundary conditions in Newtonian liquids
• Slippery-Sticky Transition of Interfacial Fluid Slip
• Intrinsic interface adsorption drives selectivity in atomically smooth nanofluidic channels
• Driving mechanisms and streamwise homogeneity in molecular dynamics simulations of nanochannel flows
• Multiscale Approach to Fluid-Solid Interfaces: An overview of methodologies coupling fluid mechanics to molecular dynamics and quantum theory
• The fluid running in the subnanochannel with functional surface