起泡剂作用下悬浮液中气泡的上升特性研究

利用高速摄像技术研究了起泡剂作用下悬浮液中气泡上升时的行为特性。观察在起泡剂作用下气泡脱离管口后0~100 ms内气泡上升形态与尺寸的演变过程,对比分析了正戊醇、聚乙二醇200和甲基异丁基甲醇三种起泡剂对固液悬浮液中气泡上升特性的影响规律差异,揭示了不同正戊醇浓度对悬浮液中气泡形态、尺寸、运动速度和上升轨迹的影响规律。研究结果表明,三种起泡剂相比,正戊醇抑制气泡形变,减小气泡尺寸,降低气泡垂直速度,抑制气泡水平运动,规范气泡上升轨迹的能力强于其他两种起泡剂;随着正戊醇浓度的增大,对气泡上升时的形变、尺寸、垂直速度、水平运动、上升轨迹的作用增强,但效果不明显;在同一正戊醇浓度作用下,增加颗粒浓度以及减小颗粒粒度会使气泡上升时的形态趋于球形或椭球形,气泡尺寸增大。

Experiment on the rising characteristics of bubbles in suspension under the action of foaming agent

The experiment uses high-speed camera technology to study the behavior characteristics of bubbles in the suspension when they rise under the action of a foaming agent. The evolution process of the rising shape and size of the bubble within 0~100ms after the bubble leaves the nozzle under the action of the foaming agent is observed. The effect of three foaming agent, 1-pentanol, polyethylene glycol 200 and methyl isobutyl methanol on the rising characteristics of bubbles in solid-liquid suspensions, was compared and analyzed. It reveals the influence of different 1-pentanol concentrations on the shape, size, movement velocity and ascent trajectory in the suspension. The research results show that: in comparison with the three foaming agent, 1-pentanol inhibits bubble deformation, reduces bubble size, reduces bubble vertical velocity, inhibits bubble horizontal movement, and regulates bubble ascent trajectory is stronger than the other two foaming agent; As the concentration of 1-pentanol increases, the effect on the deformation, size, vertical velocity, horizontal movement, and ascent trajectory of the bubble when rising increases, but the effect is gradually not obvious; Increasing the particle concentration and reducing the particle size under the same concentration of 1-pentanol will make the shape of the bubbles tend to be spherical or ellipsoid when they rise, and the size of the bubbles will increase.