Analysis of Low Reynolds Number Flow through a Pipe with an Annular Protrusion

概要

論文の詳細を見る
In order to examine the influence of an annular protrusion, which is set in a pipe in Poiseuille's flow through the pipe, two kinds of experiments were carried out; that is, head loss of the flow downstream of the protrusion was measured at several positions of the flow, and the aspect of the flow was observed by the aid of a dye streak. The flow is possibly disturbed by the protrusion even when Reynolds number (R_e) is less than its critical one, and then the friction factor becomes greater than 64/R_e. And it also becomes clear that the friction factor is given by such a function of the distance of the flow from the protrusion that the friction factor decreases as the flow goes down, and finally the factor becomes 64/R_e. From the results of a series of experiments the damping-up distance the local turbulence due to the protrusion is given as a product of power function of internal diameter of the pipe and Reynolds number of the flow. By observing the dye streak through the pipe the damping-up distance is proved to coincide with the result obtained by the experiments of the pipe friction.
一般社団法人日本機械学会の論文