基于流体微团的油滴碰撞聚结过程研究

STUDY ON COLLISION COALESCENCE PROCESS OF OIL DROPLETS BASED ON FLUID PARTICLE MODEL

建立反映油滴粒子聚结规律的流体微团模型,并使用耦合表面张力模型的CLSVOF多相流模型以及标准k-ε湍流模型对油滴粒子碰撞聚结过程进行模拟研究。结果表明:在接近速率为0.50 m/s的条件下,非均匀粒径油滴发生正向碰撞聚结的概率大于均匀粒径油滴;均匀粒径油滴发生正向碰撞聚结的概率随接近速率的增加而呈非线性增加,当接近速率从0.16 m/s提升至0.80 m/s时,其发生正向碰撞聚结的概率约增加17%;均匀粒径油滴在接近速率为0.50 m/s的条件下,油滴发生碰撞聚结的概率与碰撞角度呈负相关关系,发生碰撞聚结的有效碰撞角度介于0°~45°之间。

In the process of oil water separation by deoiling hydrocyclone,the separation effect of emulsion oil droplets and dispersed phase oil droplets whose particle sizes are less than 20μm is not ideal.A fluid particle model was established to reflect the coalescence law of oil droplets,and collision coalescence process of oil droplet particles was simulated by using the standard k-εturbulence model and the CLSVOF multiphase flow model coupled with the surface tension model.The results showed that the probability of positive collision and coalescence of non-uniform size oil droplets was greater than that of uniform size oil droplets under the condition of approaching velocity of 0.50 m/s.The probability of positive collision coalescence of oil droplets with uniform size increased nonlinearly with the approaching velocity,and when the approaching velocity increased from 0.16 m s to 0.80 m/s,the probability of forward collision coalescence increased by 17%.When the approach velocity of oil droplets with uniform particle size was 0.50 m/s,there was a negative correlation between the probability of collision coalescence and the angle of collision,and the effective collision angle for collision coalescence was 0°-45°.The research results can improve the ability of the deoiling hydrocyclone for oil water elaborately separation.