凝聚器二维单扰流柱流场中颗粒凝并模拟

Coagulating Simulation of Particles in Flow Field of Coagulator 2D Single Turbulence Column

选取二维单扰流柱为研究对象,通过CFD软件和拉格朗日方法,引入2d-LES模型模拟湍流场,采用离散相模型(DPM)计算颗粒的运动轨迹;利用欧拉方法,采用颗粒群平衡模型(PBM),通过用户自定义函数(UDF)功能分别导入湍流凝并核函数和分段核函数来进行计算,得出颗粒凝并规律.结果表明:扰流柱具有很好的产涡效果,可使不同粒径颗粒良好掺混;颗粒的湍流凝并效果显著,且湍流强度、湍动能与湍流凝并效果呈正相关.

Taking the 2Dsingle turbulence column as an object of study,the turbulent flow field was simulated using 2d-LES model by CFD software and Lagrange method,while the trajectory of particles was calculated using discrete phase model(DPM).The law of particle coagulation was subsequently obtained through further calculation by Euler's method using population balance model(PBM),via the introduction of turbulence coagulation kernel function and piecewise kernel function by the user-defined functions(UDF).Results show that the turbulence column has a good vortex effect,which makes differently sized particles be mixed effectively.The effect of turbulence coagulation is remarkable,which has a positive correlation with the turbulence intensity and energy.