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前言 清水局部阻力通常是用水头的大小来表示,并根据威斯巴赫公式计算: h_j=ξU~2/2g 由对牛顿流体局部阻力的研究可知,充分紊流区的局部阻力系数ξ只同约束的固体壁面变化形状有关,而与流动速度无关。但当流动进入层流或过渡区后,ξ则同R_0有关。高含沙浑水因呈现非牛顿体特性,极易进入层流或过渡区,因而ξ将同流动条件有关。本文是在充分试验的基础上,通过试验现象的分析,旨在揭示具有宾汉体结构的高含沙浑水的突扩明槽流的局部阻力变化规律,试验说明:
The local resistance of fresh water is usually expressed by the size of the head and calculated according to the Weibach equation: h_j = ξU ~ 2 / 2g According to the study of the local resistance of Newtonian fluid, the local drag coefficient ξ of the full turbulence zone is only the same as the constraint Of the solid wall changes in shape, and has nothing to do with the flow rate. However, when the flow into the laminar flow or transition zone, ξ is associated with R_0. Due to the non-Newtonian characteristics of high-sediment muddy water, it is easy to enter the laminar or transitional zone, so ξ will be related to the flow conditions. This article is based on the full test, through the analysis of the test phenomenon, aims to reveal the Bingham-type structure of the high-concentration muddy water suddenly out of the groove flow local resistance changes, the test shows: