Аннотация:Compared to macroscopic systems, fluids on the micro- and nanoscales
have a larger surface-to-volume ratio, thus the boundary condition becomes crucial
in determining the fluid properties. No-slip boundary condition has been applied
successfully to wide ranges of macroscopic phenomena, but its validity in
microscopic scale is questionable. A more realistic description is that the flow exhibits
slippage at the surface, which can be characterized by a Navier slip length.
We present a tunable-slip method by implementing Navier boundary condition in
particle-based computer simulations (Dissipative Particle Dynamics as an example).
To demonstrate the validity and versatility of our method, we have investigated two
model systems: (i) the flow past a patterned surface with alternating no-slip/partialslip
stripes and (ii) the diffusion of a spherical colloidal particle.