Flow of Low Reynolds Number in a Circular Straight Pipe with Various Protrusions

概要

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It is often experienced that a flow in practical pipe lines becomes a turbulent one under extraordinary low Reynolds number. In order to make clear the phenomena a flow in a circular pipe with a protrusion is examined by measuring fluid friction as a function of Reynolds number and by observing a streak line in it. And it is obviously concluded that a laminar flow through a circular straight pipe is locally disturbed by a protrusion set in the pipe and that Reynolds number when the turbulence begins is constant if the diameter and dimension and shape of the protrusion are determined, that is, a quasi-critical Reynolds number is effectively defined. And the relation between dimension and shape of a protrusion and the quasi-critical Reynolds number is investigated.
一般社団法人日本機械学会の論文