Experiment on a One-Way Flow of a Rarefied Gas Through a Straight Circular Pipe Without Average Temperature and Pressure Gradients
KYOTO UNIV (JAPAN) DEPT OF AERONAUTICSAND ASTRONAUTICS
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It is demonstrated experimentally that a one-way flow of a slightly rarefied gas is induced in a circular straight pipe of a uniform diameter with its two ends being kept at an equal temperature and pressure by beating the middle pan along the pipe and by putting up a shelf or shelves inside of a half pan of the pipe on one side of the beater. The experiment is done in a small vacuum chamber of a glass bell jar, and the flow is detected by a small windmill. A one-way flow is induced from the pan of the pipe with a shelf or shelves to that without it or them. The mechanism of the flow is explained by the difference of dependence on the cross sectional area between the thermal transpiration and Poiseuille flow.
- Fluid Mechanics