Large variation in the boundary-condition slippage for a rarefied gas flowing between two surfaces

Details Large variation in the boundary-condition slippage for a rarefied gas flowing between two surfaces Large variation in the boundary-condition slippage for a rarefied gas flowing between two surfaces

2011-09-12

arxiv.org/abs/1109.2372v1

Phys. Rev. Lett. 107, 164501 (2011)

Physics

Fluid Dynamics

Scientific paper

10.1103/PhysRevLett.107.164501

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.

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