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Experimental and Numerical Investigations on Gas Injection-Enhanced Air Gap Membrane Distillation for Water Desalination
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-20 , DOI: 10.1021/acs.iecr.1c04527 Yanqiu Pan 1 , Yici Shi 1 , Hua Li 1 , Wei Wang 2
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2022-01-20 , DOI: 10.1021/acs.iecr.1c04527 Yanqiu Pan 1 , Yici Shi 1 , Hua Li 1 , Wei Wang 2
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Gas–liquid two-phase flow enhanced air gap membrane distillation (AGMD) was investigated experimentally and numerically for water desalination. A carbon molecular sieve tube was used as the separation membrane, and nitrogen gas was selected as the injection gas. A computational fluid dynamic simulation was carried out numerically to re-emerge the AGMD with gas injection using the FLUENT software based on the volume of the fluid model. Experimental results showed that the flow pattern was the bubble flow, plug flow, slug flow, churn flow, and annular flow in sequence as the gas holdup increased. The gas injection-enhanced AGMD can significantly increase the freshwater permeate flux with the maximum of 4.7 times the value without enhancement at the churn flow. Simulation results showed good agreement with the experimentally measured flow patterns and permeate fluxes. The gas–liquid two-phase flow can promote the liquid disturbance within the membrane tube and enhance the momentum, heat, and mass transfer processes of AGMD. The gas injection enhanced the average wall shear stress, Nusselt number, temperature polarization coefficient, and mass transfer coefficient were all greater than those without gas injection. The concentration polarization coefficient with gas injection was smaller than that without gas injection. Nusselt number and mass transfer coefficient correlations were obtained based on the heat convection theory and the Knudsen-molecular diffusion mechanism. The conclusion drawn in this work provides guidance for the gas–liquid two-phase flow enhancement of membrane distillation.
中文翻译：
气体喷射增强气隙膜蒸馏用于海水淡化的实验和数值研究
气液两相流增强气隙膜蒸馏 (AGMD) 对海水淡化进行了实验和数值研究。分离膜采用碳分子筛管，注入气体选用氮气。使用基于流体模型体积的 FLUENT 软件对计算流体动力学进行数值模拟，以重新出现带有注气的 AGMD。实验结果表明，随着含气量的增加，流态依次为气泡流、塞流、段塞流、搅动流和环流。注气增强型 AGMD 可以显着增加淡水渗透通量，在搅流处没有增强的情况下，最大为 4.7 倍。模拟结果表明与实验测量的流动模式和渗透通量具有良好的一致性。气液两相流可以促进膜管内的液体扰动，增强AGMD的动量、传热和传质过程。注气增强了平均壁面剪应力，努塞尔数、温度极化系数和传质系数均大于未注气。有注气的浓差极化系数小于没有注气的浓差极化系数。基于热对流理论和克努森分子扩散机制，获得了努塞尔数和传质系数的相关性。本工作得出的结论为膜蒸馏的气液两相流增强提供了指导。
更新日期：2022-02-02
中文翻译：
气体喷射增强气隙膜蒸馏用于海水淡化的实验和数值研究
气液两相流增强气隙膜蒸馏 (AGMD) 对海水淡化进行了实验和数值研究。分离膜采用碳分子筛管，注入气体选用氮气。使用基于流体模型体积的 FLUENT 软件对计算流体动力学进行数值模拟，以重新出现带有注气的 AGMD。实验结果表明，随着含气量的增加，流态依次为气泡流、塞流、段塞流、搅动流和环流。注气增强型 AGMD 可以显着增加淡水渗透通量，在搅流处没有增强的情况下，最大为 4.7 倍。模拟结果表明与实验测量的流动模式和渗透通量具有良好的一致性。气液两相流可以促进膜管内的液体扰动，增强AGMD的动量、传热和传质过程。注气增强了平均壁面剪应力，努塞尔数、温度极化系数和传质系数均大于未注气。有注气的浓差极化系数小于没有注气的浓差极化系数。基于热对流理论和克努森分子扩散机制，获得了努塞尔数和传质系数的相关性。本工作得出的结论为膜蒸馏的气液两相流增强提供了指导。
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