摘要
本文从泥沙沉降的力学机制出发 ,考虑泥沙与液体边界的粘性作用 ,建立了泥沙群体沉降的基本运动方程 ,通过求解得到了泥沙沉降瞬时速度的一般计算式。从理论上证明了一般泥沙静水沉降由零趋近终速过程时间极短的看法 ,同时发现对于尺度较大的固体颗粒 (如抛石 ) 。
Based on the analysis of the forces acting on sediment particles in suspension, the motion equation of settling sediment is established, and a formula to calculate the settling velocity of particles is thus obtained. Some important conclusions have been reached as follows: 1. For small particles, their speed varies very fast from 0 to the constant settling velocity ω s. It only takes 9 53×10 -3 s for the particle with d=0 1mm. 2. For large size particles, such as stones, it takes more time for their speed to become close to the settling velocity from 0 than small particles. 3. The process of acceleration is relative to the concentration of suspension.
出处
《海洋工程》
CSCD
2000年第1期44-49,共6页
The Ocean Engineering
关键词
泥沙
群体沉降
非滑移条件
瞬时沉降速度
sediment
settling in group
non slip condition
settling velocity
