水介质中降落球形塑料颗粒与静止气泡的 黏附行为

为了揭示球形塑料颗粒在气泡表面的黏附行为及机理，采用高速摄影仪对自由降落的球形塑料颗粒与固定在水槽中静止气泡的黏附过程进行拍摄，利用图像处理方法提取颗粒黏附过程运动特性曲线及碰撞角与运动时间的关系，研究颗粒碰撞位置、颗粒和气泡直径对黏附行为的影响。实验结果表明:颗粒的黏附主要分为碰撞黏附和滑动黏附，气泡表面的滑动壁面假设与实验值的吻合度较高。此外，通过对实验数据的统计发现，随着碰撞角的增大，感应时间明显增长，但是颗粒陷入气泡表面的时间基本维持在10 ms，颗粒陷入气泡的深度受气泡和颗粒尺寸的共同影响，约占气泡与颗粒直径之和的2%。 

Attachment behavior of falling spherical plastic particle on static bubbles in water medium

In order to investigate the behavior and mechanism of spherical plastic particles attaching to the bubble surface, observations were made in a model system in which spherical plastic particles were dropped onto a stationary air bubble formed in water within a glass cell. Their interaction was recorded by high-speed digital video. The image processing method was used to extract the particle trajectories, the relationship between the collision angle and the movement time. The influence of the collision position of the particles and the diameter of bubble and particles on their adhesion behavior was studied. The experimental results show that the attachment of particles is mainly divided into collision attachment and sliding attachment. The mobile surface assumption of the bubble surface agrees very well with the experimental value. In addition, through the statistics of multiple experimental data, it is found that with the increase of the collision angle, the induction time increases significantly, but the time for the particles to fall into the bubble surface is maintained at 10 ms. The depth of the particles trapped in the bubble is affected by both the bubble and the particle size, accounting for about 2% of the sum of bubble diameter and particle diameter.