带翼片侧向流斜板沉淀池内颗粒沉降过程的数值模拟

采用有限体积法研究了带翼片侧向流斜板沉淀池内水流流动的特性,并计算了带翼片与不带翼片斜板内水流的雷诺数,结果表明加入翼片可以明显降低水流的雷诺数,其数值为不带翼片斜板雷诺数的42%,并采用层流模型计算了两种情况斜板内水流的三维流场分布情况.在此基础上考察了加入稀疏颗粒后,颗粒物的运动轨迹,采用DPM模型进行计算,结果表明,加入翼片后颗粒物沉降的路径缩短,有利于固液分离;随着水流速度的增大,颗粒跟随性增强,颗粒物密度(采用1100kg/m3和1 400 kg/m3进行分析)增大,颗粒沉降性也增强.同时大颗粒粒径也有利于沉淀.

Numerical study of particles settling processes in lateral flow settling tank with inclined vane plates

The finite volume method is used to study the lateral flow in settling tank with in- clined vane plates.Reynolds number is calculated in both cases with and without vanes.The calcu- lated results show that Reynolds number is reduced dramatically to 42% in vanes case comparing with no vanes.The three-dimensional flow field was also calculated.The settling trace of solid par- ticles is calculated using Discrete Particle Model(DPM).The results show that vanes can speed up the solid and liquid separating process,with the inlet velocity increasing,the inertial force is strengthened.The density of solid particles are 1100 kg/m~3 and 1400 kg/m~3 separately,with the density increasing,the settling ability is increased.The larger diameter of the solid particles,the better settling ability of the solid particles behaves.