Transport of convected soluble surfactants on and within the foam film in the context of a foam fractionation process
Transport of convected soluble surfactants on and within the foam film in the context of a foam fractionation process
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在泡沫分馏过程中，对流可溶性表面活性剂在泡沫膜上和泡沫膜内的传输
DOI：
10.1016/j.ces.2023.119100
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发表时间：
2023
影响因子：
4.7
通讯作者：
Rajabi H
中科院分区：
文献类型：
--
作者：
Rajabi H
本研究模拟了可溶表面活性剂在有回流的泡沫分馏系统中的对流输送。由于回流，膜内表面活性剂的初始浓度低于高原边界。马兰戈尼流和膜排水流在膜表面和体内产生对流表面活性剂。在膜体内部建立了一个称为分离矩阵的界面：它将表面活性剂浓度均匀的两个区域分开，一个浓度等于初始膜的浓度，另一个浓度等于高原边界的浓度。跟踪分离基质的演变，以确定表面活性剂的回收和富集。表面活性剂薄膜从回流中获益最多。然而，对于最初表面活性剂相对丰富的膜，由于膜排水，采收率实际上可能在很长一段时间内下降。尽管如此，表面活性剂瘦膜和那些含有表面活性剂只有中等溶解度的膜受益于回流，即使膜排水。
This study models convective transport of soluble surfactant in a foam fractionation system with reflux. Owing to reflux, initial surfactant concentration in films is lower than in Plateau borders. Marangoni flows and film drainage flows arise convecting surfactant both on the film surface and in the bulk. An interface is set up within the film bulk called a separatrix: this divides two regions of uniform surfactant concentration, one with concentration equal to that of the initial film and one with concentration equal to that in the Plateau border. The evolution of the separatrix is tracked to determine surfactant recovery and enrichment for the film. Surfactant lean films benefit most from reflux. However for films that are initially comparatively surfactant rich, recovery might actually decrease at long times owing to film drainage. Nonetheless surfactant lean films and those containing surfactant with only moderate solubility benefit from reflux even despite film drainage.