Flow behaviour and local concentration of coarse particles-water mixture in inclined pipes
Flow behaviour and local concentration of coarse particles-water mixture in inclined pipes
复制标题
DOI：
10.1515/johh-2017-0001
复制
发表时间：
2017-06
影响因子：
1.9
通讯作者：
P. Vlasák;Z. Chára;J. Konfršt
中科院分区：
文献类型：
--
作者：
P. Vlasák;Z. Chára;J. Konfršt
在内径D = 100 mm的光滑不锈钢管组成的实验回路上，对平均粒径为11.5 mm的窄粒径分布玄武岩卵石在不同倾角的管段中的水力输送进行了实验研究，在管段观察段中研究了混合物的流动特性和颗粒沿管底沿着的运动规律。用γ射线密度计研究了管道截面上的浓度分布。该研究是指混合物的速度，总浓度，和管道的弦平均浓度分布和局部浓度图的倾斜角度的影响，和流动行为的粗颗粒水混合物。研究表明，粗颗粒-水的混合物在倾斜的管段显着分层，固体颗粒移动主要靠近管道仰拱，并为较高和中等流速的颗粒跃移成为颗粒输送的主导模式。
Abstract Narrow particle size distribution basalt pebbles of mean particle size 11.5 mm conveyed by water in the pipe sections of different inclination were investigated on an experimental pipe loop, consisting of smooth stainless steel pipes of inner diameter D = 100 mm. Mixture flow-behaviour and particles motion along the pipe invert were studied in a pipe viewing section, the concentration distribution in pipe cross-section was studied with the application of a gamma-ray densitometer. The study refers to the effect of mixture velocity, overall concentration, and angle of pipe inclination on chord-averaged concentration profiles and local concentration maps, and flow behaviour of the coarse particle-water mixtures. The study revealed that the coarse particle-water mixtures in the inclined pipe sections were significantly stratified, the solid particles moved principally close to the pipe invert, and for higher and moderate flow velocities particle saltation becomes the dominant mode of particle conveying.