A simple experiment is performed to demonstrate that a one-way flow of a rarefied gas can be induced through a pipe without average pressure and temperature gradients by devising the shape of the pipe. A one-way flow is found to be induced through a pipe consisting of two circular pipes of different diameters connected and heated at their joint in the middle part of the pipe. The flow is from the thinner pipe to the thicker. In a pipe of a uniform diameter, no one-way flow is induced even when it is heated at a position away from the middle of the pipe.
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The temperatures at all the points are not measured simultaneously, but the temperature at two ends are measured at each time. The data are the results of repeated measurements, and similar results are obtained if the room temperature does not change much.
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