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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

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 …