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采用高速摄像装置观测液相体系中2个相邻气泡之间的兼并现象.通过添加甲基异丁基甲醇(MIBC)、仲辛醇(2-Octonal)和甲氧基聚丙烯乙二醇(DF-250)3种具有起泡性质的表面活性剂来改变液相体系的表面张力和气液界面弹性,并在这3种起泡溶液中记录分析了气泡在接触过程中的兼并行为.研究表明:溶液的表面张力随着起泡剂质量浓度的增大而减小,并最终达到平衡;气泡之间的兼并时间随着起泡剂表面活性的提高而延长;相同用量条件下,起泡剂分子量越大,溶液中气泡的兼并时间越长;溶液的气液界面弹性随着起泡剂质量浓度的增加而增大,并在表面张力平衡值附近出现拐点,这与气泡兼并时间的变化规律一致.起泡剂MIBC,2-Octoanl和DF-250在表面张力平衡质量浓度条件下所对应的气泡兼并时间分别为8.34,10.50和13.47s.
A high-speed camera device was used to observe the mergence between two adjacent bubbles in the liquid phase system.After adding methylisobutylmethanol (MIBC), 2-Octonal and methoxypolypropylene glycol DF-250), three kinds of surfactants with foaming property were used to change the surface tension and the liquid-air interface elasticity of the liquid-phase system, and the merging behavior of the bubbles in the contact process was recorded and analyzed in the three kinds of foaming solutions. : The surface tension of the solution decreases with the increase of the mass concentration of the blowing agent and finally reaches the equilibrium; the time of the merge between the bubbles increases with the increase of the surface activity of the blowing agent; under the same conditions, the foaming agent The larger the molecular weight is, the longer the bubble merger time. The gas-liquid interface elasticity of the solution increases with the increase of the concentration of the blowing agent, and the inflection point appears near the equilibrium value of the surface tension. The bubble mergers of MIBC, 2-Octoanl and DF-250 at the equilibrium concentrations of surface tension were 8.34,10.50 and 13.47s, respectively.