Experimental Investigation of Temperature Polarization near Membrane Surface During Air Gap Membrane Distillation Processes.

IF 3.3 4区 工程技术 Q2 CHEMISTRY, PHYSICAL
Lianqi Jing, Jiaqi Sun, Yaoling Zhang, Jiaming Chen, Fei Guo
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Abstract

Temperature polarization is a critical factor influencing the performance of membrane distillation. The presence of temperature polarization causes the temperature of the fluid near the membrane surface to be different from that in the bulk region, reducing the effective temperature difference across the membrane and thus diminishing the transmembrane mass transfer driving force. This study investigates the monitoring of temperature polarization and its effects on the transmembrane mass transfer performance in a typical air gap membrane distillation system. A set of thermocouples within a feed module were employed to monitor and capture the development of the temperature polarization profile. The test results reveal that temperature polarization reduces the effective temperature difference across the membrane, leading to a certain difference between the theoretical estimation and experimental values of the mass transfer coefficient across the porous membrane. To address this issue, the temperature polarization factor was further analyzed as a metric to quantify the impact of temperature polarization on the transmembrane flux in membrane distillation, with a detailed discussion of its range and implications.

气隙膜蒸馏过程膜表面温度极化的实验研究。
温度极化是影响膜蒸馏性能的关键因素。温度极化的存在使膜表面附近流体的温度与体积区域的温度不同,从而减小了膜上的有效温差,从而减小了跨膜传质驱动力。研究了典型气隙膜蒸馏系统中温度极化的监测及其对跨膜传质性能的影响。一组热电偶在馈电模块中被用来监测和捕捉温度极化曲线的发展。实验结果表明,温度极化降低了膜上的有效温差,导致多孔膜上传质系数的理论估计值与实验值存在一定的差异。为了解决这一问题,进一步分析了温度极化因子作为一个度量来量化温度极化对膜蒸馏中跨膜通量的影响,并详细讨论了其范围和意义。
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来源期刊
Membranes
Membranes Chemical Engineering-Filtration and Separation
CiteScore
6.10
自引率
16.70%
发文量
1071
审稿时长
11 weeks
期刊介绍: Membranes (ISSN 2077-0375) is an international, peer-reviewed open access journal of separation science and technology. It publishes reviews, research articles, communications and technical notes. Our aim is to encourage scientists to publish their experimental and theoretical results in as much detail as possible. There is no restriction on the length of the papers. Full experimental and/or methodical details must be provided.
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