Abstract Appendix CMembrane pore wetting is a unique and important technical challenge for membrane distillation (MD). While the general principle of pore wetting is well known, the detailed mechanism of pore wetting induced by surfactants that can actively adsorb onto membrane pore surface has not been theoretically elucidated. In this study, we developed a theoretical model, based on surfactant transport in a partially wetted membrane pore under the pseudo-steady state assumption, to quantify the kinetics of pore wetting. The theoretical model predicts several key dependences of wetting kinetics on operating parameters and solution properties, which are highly consistent with results from MD experiments using feed solution containing sodium dodecyl sulfate. It was found that kinetics of pore wetting is strongly dependent on vapor flux, surfactant concentration, but relatively independent of the transmembrane hydraulic pressure. The critical surfactant concentration below which pore wetting does not occur was also predicted by the wetting model. Finally, the impact of surfactant species on wetting kinetics was also discussed.

中文翻译：

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膜蒸馏中表面活性剂诱导孔隙润湿的动力学模型

摘要 CM 膜孔润湿是膜蒸馏 (MD) 的一项独特而重要的技术挑战。虽然孔润湿的一般原理是众所周知的，但由可以主动吸附到膜孔表面的表面活性剂引起的孔润湿的详细机制尚未在理论上阐明。在这项研究中，我们开发了一个理论模型，该模型基于在伪稳态假设下部分润湿的膜孔中的表面活性剂传输，以量化孔润湿的动力学。理论模型预测了润湿动力学对操作参数和溶液性质的几个关键依赖性，这与使用含有十二烷基硫酸钠的进料溶液的 MD 实验结果高度一致。发现孔隙润湿的动力学强烈依赖于蒸汽通量，表面活性剂浓度，但相对独立于跨膜水压。润湿模型还预测了临界表面活性剂浓度，低于该浓度不会发生孔隙润湿。最后，还讨论了表面活性剂种类对润湿动力学的影响。