Abdelrazeq Haneen, Khraisheh Majeda
Department of Chemical Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar.
Polymers (Basel). 2023 Apr 8;15(8):1821. doi: 10.3390/polym15081821.
Membrane distillation (MD) is a thermal-based membrane operation with high potential for use in the treatment of aqueous streams. In this study, the linear relationship between the permeate flux and the bulk feed temperature for different electrospun polystyrene membranes is discussed. The dynamics of combined heat and mass transfer mechanisms across different membrane porosities of 77%, 89%, and 94%, each with different thicknesses, are examined. The main results for the effect of porosity with respect to the thermal efficiency and evaporation efficiency of the DCMD system are reported for electrospun polystyrene membranes. A 14.6% increase in thermal efficiency was noted for a 15% increase in membrane porosity. Meanwhile, a 15.6% rise in porosity resulted in a 5% increase in evaporation efficiency. A mathematical validation along with computational predictions is presented and interlinked with the maximum thermal and evaporation efficiencies for the surface membrane temperatures at the feed and temperature boundary regions. This work helps to further understand the interlinked correlations of the surface membrane temperatures at the feed and temperature boundary regions with respect to the change in membrane porosity.
膜蒸馏（MD）是一种基于热的膜操作，在处理水流方面具有很高的应用潜力。在本研究中，讨论了不同电纺聚苯乙烯膜的渗透通量与料液主体温度之间的线性关系。研究了孔隙率分别为77%、89%和94%且厚度不同的不同膜的传热传质联合动力学机制。报告了电纺聚苯乙烯膜孔隙率对直接接触式膜蒸馏（DCMD）系统热效率和蒸发效率影响的主要结果。膜孔隙率增加15%时，热效率提高了14.6%。同时，孔隙率增加15.6%导致蒸发效率提高5%。给出了数学验证以及计算预测，并将其与进料和温度边界区域表面膜温度的最大热效率和蒸发效率相关联。这项工作有助于进一步理解进料和温度边界区域表面膜温度相对于膜孔隙率变化的相互关联。
