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研究使用改性后具有疏水性表面的玻璃微珠模拟矿物颗粒,利用高速动态摄像系统测量了颗粒与气泡间的碰撞、黏附,以及气泡液膜破裂,形成气-液-固三相体的微观过程.对颗粒滑动速度的分析表明:颗粒在接触气泡表面之前,速度逐渐增加直至达到沉降末速;当颗粒接触到气泡表面时,颗粒在两者间的液膜中滑动,表现为逐渐变慢;滑动过程中气泡液膜发生破裂,气-液-固三相接触,视觉上表现为颗粒突然陷入气泡表层,数值上表现为滑动速度出现一个跳跃点,即速度突然增大后再立即恢复到一定数值,随后在三相界面中继续滑动直至滞止在气泡底端.本文还探讨了不同药剂体系中颗粒在气泡表面的滑动行为.
In this study, glass beads modified with hydrophobic surface were used to simulate mineral particles. The collisions and adhesion between particles and bubbles and the rupture of bubble liquid membrane were measured by a high-speed dynamic camera system to form microstructure of gas-liquid-solid three-phase The analysis of the particle slip velocity shows that the particle velocity gradually increases until it reaches the final velocity before it contacts the surface of the bubble. When the particle touches the bubble surface, the particle slides in the liquid film between the two, In the process of sliding, the rupture of bubble liquid film and the gas-liquid-solid three-phase contact show visually that the particles suddenly fall into the surface of the bubble. The numerical value is that the slip velocity appears a jumping point, that is, the velocity suddenly increases and then immediately returns to A certain value, and then continue to slide in the three-phase interface until stagnation at the bottom of the bubble.In this paper, we also explore the particles in different drug systems in the bubble surface sliding behavior.