title: Large variation in the boundary-condition slippage for a rarefied gas flowing between two surfaces.
abstract: We study the slippage of a gas along mobile rigid walls in the sphere-plane confined geometry and find that it varies considerably with pressure. The classical no-slip boundary condition valid at ambient pressure changes continuously to an almost perfect slip condition in a primary vacuum. Our study emphasizes the key role played by the mean free path of the gas molecules on the interaction between a confined fluid and solid surfaces and further demonstrates that the macroscopic hydrodynamics approach can be used with confidence even in a primary vacuum environment where it is intuitively expected to fail.
authors: Institut Néel, CNRS and Université Joseph Fourier, Grenoble, France.
authors: J
authors: J
authors: Laurent
authors: A
authors: A
authors: Drezet
authors: H
authors: H
authors: Sellier
authors: J
authors: J
authors: Chevrier
authors: S
authors: S
authors: Huant