水との密度差が小さい粗大粒子の混入による管摩擦損失減少効果

概要

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In a flow of solid-particle/water mixture in a circular pipe with a 77 mm diameter, the concentration of particles was varied continuously. The flow rate, the hydraulic gradient and the solid fraction were measured. Two kinds of plastic-beads with different densities and sizes were used as the sample. The conclusions are summarized as follows. (1) The pressure loss reduction effect due to the mixing of particles can be caused whether the density of particles is greater or smaller than that of water. (2) The reduction ratio of the hydraulic gradient is represented roughly as a function of the relative solid fraction and the Froude number F_d referring to the particle size. (3) The pressure loss reduction effect occurs when F_d>2000, and the maximum reduction ratio attained in this work is about 7%.
一般社団法人日本機械学会の論文
1987-06-25