Analysis on Boundary Condition in High Knudsen Number Flow

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The gas-surface interaction is important as the boundary condition of the high Knudsen number flows. The accommodation coefficient, which represents the gas-surface interaction as a parameter, was measured and analyzed. Energy accommoda-tion coefficient for platinum was obtained by measuring the heat flux from heated metal wire to gas under the medium vacuum condition using a simple experimental system. The tangential momentum accommodation coefficient for fused silica and platinum was de-duced from the mass flow rate measurement through a microtube. The characteristics of the accommodation coefficient were analyzed by the molecular dynamics method.