水力旋流器内科里奥利力的量级分析研究

科里奥利力是在旋转坐标系中由于物体相对于旋转坐标系运动所产生的一种惯性力,简称科氏力。水力旋流器的内部流场是高速旋转的离心分离流场。本研究采用计算流体力学方法模拟水力旋流器内高浓度分散相的分布,对颗粒受到的科氏力进行分析。RSM模型用于描述流场的湍动特性,LPT模型对颗粒相的运动进行追踪,模拟结果与试验数据的吻合性较好。结果表明,在水力旋流器内,由于锥体段的湍流强度较高,科氏力的方向具有较强的随机性。在切向方向,随粒径增大,曳力和压力梯度力递减而科氏力递增,当粒径增大到52μm时,科氏力的量级与曳力相当,此时科氏力的作用是不可忽略的。

Study of the Magnitude Analysis of Coriolis Force in Hydrocyclone

Coriolis force is an inertial force generated due to the movement of the object relative to the rotating coordinate system. There is a high-speed rotating centrifugal field in the hydrocyclone. This paper mainly used computational fluid dynamics method to study the Coriolis force that acts on the particles. Turbulence was simulated by Reynolds stress model and Stochastic Lagrangian Particle Tracking model was applied to predict the motion of these particles. Simulated results were in agreement with the reported experimental data. In the conical section of hydrocyclone,the strong randomness of the direction of Coriolis force can be found which is probably due to the high turbulence intensity. In the tangential direction,the Coriolis force goes up and the drag force and pressure gradient force decreaseswith the increase of particle diameter. When the particle diameter reaches 52μm in the case,the magnitude of Coriolis force is matched with drag force. The effect of Coriolisforce cannot be ignored.