固体颗粒的群体沉降速度分析  

Analysis of group settling velocity for solid particles

作　　者：郑邦民[1] 夏军强[2] 

机构地区：[1]武汉大学河流系,湖北武汉430072 [2]清华大学水利系,北京100084

出　　处：《泥沙研究》2004年第6期40-45,共6页Journal of Sediment Research

摘　　要：从流体力学原理出发 ,数值模拟非均匀沙随机分布对流场的影响 ,推导出固体颗粒群体沉速的理论解。该公式不仅量纲和谐 ,浓度变化不超过极限浓度值 ,能反映含沙量与非均匀沙级配变化对群体沉速的影响 ,而且可避免其它公式量纲不和谐 ,计算中出现负值或降得过快的缺点。采用黄河实测资料对该公式进行了验证 ,计算结果与实测资料基本符合。According to the basic principle of fluid dynamics, the influence of random distribution of nonuniform sediments on the velocity field was simulated numerically, and theoretical solution of group settling velocity for solid particles was obtained. This formula with a homogeneous dimension accounts for the effect of sediment concentration and composition on group settling velocity, and the maximum of sediment concentration in the equation is less than the critical value. Furthermore, this formula can avoid some shortcomings that minus or very small value occurs when using other formulas to calculate settling velocity. Finally, the formula proposed in this paper was verified using the data observed in the Yellow River, and calculated results agreed with the observed data.

关 键 词：固体颗粒 群体沉速 干扰流核 极限浓度 

分 类 号：TV142[水利工程—水力学及河流动力学]