摘要
采用离散元方法 (CFD-DEM)对微通道内颗粒流动特性进行了数值模拟。以微通道内随液相流动的颗粒为研究对象,应用欧拉-拉格朗日模型,同时考虑液固两相间耦合作用,模拟建立了二维阶梯状微通道模型,研究通过改变颗粒粒径和体积分数、液相粘度和速度等因素,得到了微通道内颗粒运动轨迹、滞留数目、瞬时速度分布等参数的变化规律。模拟结果显示,颗粒粒径增大,颗粒瞬时速度减小,滞留在通道内的颗粒增多;颗粒体积分数和液相粘度增大时,颗粒速度均先增大后减小,但增大颗粒数量会使滞留颗粒增多,增大液相粘度和密度会使滞留颗粒减少。颗粒的粒径大、数量多会使得颗粒更易沉降在通道底部,堵塞通道。
The hydrodynamic flow characteristics of liquid-solid in micro-channel were simulated by DEM-CFD. By changing the particle diameters,particle volume fraction, liquid viscosity and velocity, the trajectories of particles, blocking number of particles and instantaneous velocity of particles were obtained. Simulated results showed that, with the increase of particle diameter, the axial and radial velocities decreased; while they firstly increased and then decreased with the increase of particle volume fraction, and the number of blocking particles increased; Increasing liquid viscosity and velocity reduced the number of blocking particles.
作者
李好婷
LI Hao-ting(College of Petroleum Engineering, Northeast Petroleum University, Heilongjiang Daqing 163318, China)
出处
《辽宁化工》
CAS
2017年第11期1128-1131,共4页
Liaoning Chemical Industry
