摘要
分析水击谐波场作用下乳化油液分散相液滴的微观运动特征,探讨分散相液滴聚集、分散的临界条件,以控制实现油水的有效分离,为深入研究水击谐波的油水分离方法提供技术支撑。通过施加不同的激振力获取了相应的水击谐波场,利用PIV图像采集系统对油水混合液在水击谐波场作用下水滴的微观运动特征进行了研究。结果表明:在施加6N^12N激振力作用下,在水击谐波流场中分散相液滴在波节18.2mm附近产生的聚集涡流以及在波腹68.2mm附近发散产生的涡流比较明显;分散相液滴随着施加激振力的减小,轴向速度幅值增加,在实验管道的自由平面其径向速度幅值相对较大,而在实验管道底部幅值较小;分散相液滴的平均运动速度随着激振力的减小而减小,但其径向速度幅值总体增加,所以较小激振力的水击谐波场有利于提高油水分离效率。
In order to obtain the micro motion characteristics of the dispersed phase droplets under the action of the water hammer harmonic field, the critical condition of the dispersed phase droplet aggregation and dispersion is obtained to control the effective separation of oil and water, it provides technical support for the further research on the water oil separation method of water hammer. The micro motion process of oil-water mixture is investigated by using(Particle Image Velocimetry, PIV) image acquisition system. The velocity field of the dispersed phase droplet flow is analyzed by applying different excitation forces to obtain the corresponding water hammer harmonic fields. The results show that the dispersed phase droplet appears as converging vortex flow near the wave node(18.2mm) and as diverging vortex flow near the wave loop(68.2mm) obviously in the water hammer harmonic under the action of exciting force 6N ~12N; the axial velocity amplitude of the dispersed phase of the emulsion oil droplets increases with the increase of the applied force, the radial velocity is relatively large in the experimental pipeline, and is smaller in bottom of the experimental pipeline; the average velocity of the dispersed phase droplets decreases with the decrease of the exciting force, the velocity of the dispersed phase droplets increases with the increase of water hammer; and the radial velocity amplitude of the dispersed phase droplets increases, the reduction of excitating force is beneficial to the aggregation of particles.
出处
《应用力学学报》
CSCD
北大核心
2017年第5期912-918,共7页
Chinese Journal of Applied Mechanics
基金
国家自然科学基金(51375516)
重庆市基础与前沿研究计划项目(cstc2016jcyjA0185)
关键词
水击谐波场
油水分离
分散相液滴
运动速度
粒子图像测速
water hammer harmonic field
oil water separation
dispersed phase droplet
movement speed
particle image velocimetry(PIV)
