Transport of soluble surfactant on and within a foam film in the context of a foam fractionation process
Transport of soluble surfactant on and within a foam film in the context of a foam fractionation process
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在泡沫分馏过程中，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.2022.118171
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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
这项研究模拟了泡沫分馏过程中可溶表面活性剂在泡沫膜上和泡沫膜内的传输。Marangoni流将表面活性剂驱动到薄膜上，并且假设表面活性剂浓度在整个薄层泡沫薄膜中是均匀的。吸附等温线被用来耦合传质方程，从而确定表面活性剂(表面和本体)在任何膜位置的总量的演变。表面活性剂的传输被认为是在没有和存在膜排水的情况下。观察到，与使用不可溶表面活性剂的情况相比，具有可溶表面活性剂的情况减缓了Marangoni驱动流的演变。这是因为在可溶性表面活性剂的情况下，表面活性剂即使在被Marangoni转移到薄膜表面的同时也会扩散到主体中。此外，观察到在长时间后通常会出现准稳态，从而使Marangoni流和膜引流变得可比。
This study models soluble surfactant transport on and within a foam film during a foam fractionation process. Marangoni flow drives surfactant onto the film, and also surfactant concentration is assumed to be uniform across the thin foam film. Adsorption isotherms are used to couple mass transfer equations, so as to determine the evolution of the total amount of surfactant (surface plus bulk) at any film location. Surfactant transport is considered both in the absence and presence of film drainage. It is observed that having soluble surfactant slows down evolution of Marangoni-driven flow compared to cases assuming insoluble surfactant. This is because in soluble surfactant cases, surfactants diffuse to the bulk even whilst being transferred by Marangoni flow onto the film surface. Furthermore, it is observed that a quasisteady state typically occurs after a long time, such that Marangoni flow and film drainage flow become comparable.