Abstract
The author considered theoretically viscous flows at a rounded pipe exit. It is well known that separation occurs at a slight by divergent angle. In this report, the author formed the equation of momentum with general orthogonal coordinates, solved it by an iso-clined method which is the same as Pohlhausen's one and obtained approximately the position of separation point. The results are as follows. (1) The position of separation point exists at a large angle if it is measured with the angle which corresponds to a cone angel.(2) Separation point is changed by Reynolds number. According as Reynolds number becomes smaller, separation point moves outward.(3) The valueΛ at the end of a straight pipe is decided from the condition that the equation of momentum does not become indefinite. This method corresponds to one which decided Λ at a stagnation point in a boundary layer.
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