基于PIV的油中水滴速度的特征分析

发布时间：2018-03-08 07:20

  本文选题：水击谐波场　切入点：油水分离　出处：《应用力学学报》2017年05期 　论文类型：期刊论文

【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。
[Abstract]:The microscopic motion characteristics of droplets in dispersed phase of emulsified oil under the action of harmonic field of water hammer are analyzed, and the critical conditions for the aggregation and dispersion of dispersed droplets are discussed in order to control the effective separation of oil and water. In order to provide technical support for further research on oil-water separation method of water hammer harmonics, the corresponding harmonic field of water hammer is obtained by applying different exciting forces. Using PIV image acquisition system, the microscopic motion characteristics of oil / water mixture under the action of harmonic field of water hammer are studied. The results show that: under the action of 6N ~ (12) N excitation force, In the harmonic flow field of water hammer, the agglomeration eddy current produced by dispersed droplets near 18.2 mm of nodal and the eddy current produced by divergence around 68.2 mm of wave belly are obvious, and the amplitude of axial velocity increases with the decrease of excitation force applied in dispersed phase droplets. In the free plane of experimental pipeline, the amplitude of radial velocity is relatively large, while at the bottom of experimental pipeline, the amplitude of radial velocity decreases with the decrease of exciting force, but the amplitude of radial velocity increases. Therefore, the harmonic field of water hammer with small exciting force is helpful to improve the efficiency of oil-water separation.
【作者单位】： 重庆工商大学废油资源化技术与装备教育部工程研究中心;
【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)
【分类号】：TQ028
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本文编号：1582921