發(fā)布時間：2018-12-12 15:02

【摘要】：采用高速攝像裝置觀測液相體系中2個相鄰氣泡之間的兼并現(xiàn)象.通過添加甲基異丁基甲醇(MIBC)、仲辛醇(2-Octonal)和甲氧基聚丙烯乙二醇(DF-250)3種具有起泡性質的表面活性劑來改變液相體系的表面張力和氣液界面彈性,并在這3種起泡溶液中記錄分析了氣泡在接觸過程中的兼并行為.研究表明:溶液的表面張力隨著起泡劑質量濃度的增大而減小,并最終達到平衡;氣泡之間的兼并時間隨著起泡劑表面活性的提高而延長;相同用量條件下,起泡劑分子量越大,溶液中氣泡的兼并時間越長;溶液的氣液界面彈性隨著起泡劑質量濃度的增加而增大,并在表面張力平衡值附近出現(xiàn)拐點,這與氣泡兼并時間的變化規(guī)律一致.起泡劑MIBC,2-Octoanl和DF-250在表面張力平衡質量濃度條件下所對應的氣泡兼并時間分別為8.34,10.50和13.47s.
[Abstract]:A high speed camera was used to observe the merger of two adjacent bubbles in liquid phase system. The surface tension and gas-liquid interfacial elasticity of liquid phase system were changed by adding three kinds of surfactants of methyl isobutyl methanol (MIBC), secondary octanol (2-Octonal) and methoxy polypropylene glycol (DF-250) with foaming properties. In these three kinds of bubbling solutions, the behavior of bubble merger during contact was recorded and analyzed. The results show that the surface tension of the solution decreases with the increase of the concentration of the foaming agent, and finally reaches equilibrium, and the merging time between the bubbles is prolonged with the increase of the surface activity of the foaming agent. Under the same dosage, the bigger the molecular weight of foaming agent, the longer the time of bubble merging in solution. The gas-liquid interface elasticity of the solution increases with the increase of the concentration of foaming agent, and the inflection point appears near the equilibrium value of surface tension, which is consistent with the change of bubble merging time. The bubble merger time of foaming agents MIBC,2-Octoanl and DF-250 under the condition of equilibrium mass concentration of surface tension is 8.34 ~ 10.50 and 13.47 s, respectively.
【作者單位】： 中國礦業(yè)大學化工學院;中國礦業(yè)大學國家煤加工與潔凈化工程技術研究中心;
【基金】：國家自然科學基金項目(51504254,51274198) 十二五國家科技支撐計劃項目(2014BAB01B04) 中國礦業(yè)大學基本科研業(yè)務費學科前沿科學研究專項(2015XKMS039)
【分類號】：TD923.12

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