气泡在自由液面破裂时间分析及颗粒的影响

Burst time analysis of free liquid surface bubbles and study of particle effects

以速度为标准,阐述了气泡从接触液面至破裂的3个阶段,并进行了同等条件下有/无疏水颗粒对气泡破裂过程影响的对比实验。基于所获的实验数据,分析发现加入疏水颗粒促进了气泡和自由液面的碰撞。利用Princen方程和MTR模型,计算得出随着碰撞次数的增加,液膜半径减小,同时液膜厚度相应减小;通过雷诺润滑理论证明了液膜厚度与气泡破裂时间的关联关系,并对破裂时间进行了定量分析。研究结果表明加入疏水颗粒可以使液膜厚度减薄,进而减小气泡破裂时间。

Three stages of bubble from contact liquid to rupture were described,which was based on the velocity of bubble.And the comparative experiment of hydrophobic particles under the same conditions was carried out.Based on the experimental data,it is found that adding hydrophobic particles promotes the collision on the free interface.It is also reported that the radius of the film decreases and the thickness of the film decreases with the increase of the number of collisions through the Princen equation and MTR model.The relationship between the thickness of the film and the bubble rupture time is proved by Reynolds lubrication theory,then the fracture time is quantitatively analyzed.The results show that as the thickness of the liquid film can be thinned adding hydrophobic particles can reduce the film thickness and reduce the bubble rupture time.