| 罗文锋,艾南山,丁晶,李后强.宾汉体水流中泥沙起动机理[J].水利学报,2000,31(12):0064-0068 |
| 宾汉体水流中泥沙起动机理 |
| Mechanism of initiation of sediment in Bingham flui |
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| DOI： |
| 中文关键词: 宾汉极限剪切力 泥沙 起动拖曳力 |
| 英文关键词: Bingham yield stress sediment critical stress |
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| 中文摘要: |
| 本文分析了宾汉流体中宾汉极限剪切力τB对泥沙起动起阻碍作用的力学机制，得出均匀无粘性沙的起动拖曳力的一般表达式。并对结果定性分析得到：(1)存在粒径D*，对粒径小于0.1D*的泥沙，起动中重力因素可忽略不计；对粒径大于10D*的泥沙，宾汉极限剪切力因素可忽略不计。(2)宾汉流体中τc随颗粒粒径D的变化关系为马鞍状曲线。存在某个粒径Dmin，其所需τc最小。 |
| 英文摘要: |
| Based on the mechanism of Bingham yield stress acting on sediment in Bingham fluid, a physics model for initiation of sediment is proposed and the general formula for critical shear stress of sediment is derived. It is found that a specific particle diameter is existed. The effect of gravity can be ignored if the diameter of sediment is smaller than the specific diameter; other-wise, the effect of Bingham yield stress can not be ignored. It also found that there exits a certain diameter for which the yield stress will be minimum. |
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