That the flow is from left to right can scarcely be deduced from the streamline pattern, because in the limit of zero Reynolds number the flow past a solid body is reversible, and hemce symmetric about a symmetric shape. It resembles superficially the pattern of potencial flow in figure Hele-Shaw flow past a circle, but disturbances to the uniform stream die off much more slowly. The flow of water is shown by aluminum dust Photograph by Sadatoshi Taneda.
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