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化学工业与工程 2016, Vol. 33 Issue (6) :80-87    DOI: 10.13353/j.issn.1004.9533.20151085
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减压膜蒸馏过程纤维膜表面热质传递特征模拟分析
刘军1,2,3,4, 李保安1,2,3,4
1. 天津大学化工学院, 天津 300072;
2. 化学化工协同创新中心, 天津 300072;
3. 化学工程联合国家重点实验室, 天津 300072;
4. 天津市膜科学与海水淡化重点实验室, 天津 300072
Simulation Analysis of Heat and Mass Transfer on Fiber Surface in Vacuum Membrane Distillation Process
Liu Jun1,2,3,4, Li Baoan1,2,3,4
1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China;
2. Collaborative Innovation Center of Chemical Science and Engineering(Tianjin), Tianjin 300072, China;
3. State Key Laboratory of Chemical Engineering, Tianjin 300072, China;
4. Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin 300072, China
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摘要 

采用CFD数值模拟的方法，建立了错流式单根中空纤维减压膜蒸馏过程的三维计算模型，对纤维膜表面不同位置的局部热量和质量传递特征进行了研究。研究结果表明，纤维膜表面的速度分布、温度分布、对流传热系数分布以及蒸发速率均随着位置的改变而改变，且具有相似的规律，在相位角60°到90°之间有最大值，而在相位角0°和180°附近其值较小；料液流速显著影响纤维膜表面的热质传递参数的分布，蒸发速率和传热系数均随着流速的提高而增大；传热系数随着真空度的提高而迅速降低。本研究结果加深了对中空纤维减压膜蒸馏过程的认识，对膜过程强化具有指导意义。
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刘军
李保安
关键词： 中空纤维；   减压膜蒸馏；   数值模拟；   蒸发速率；   传热系数     
Abstract：

Vacuum membrane distillation (VMD) has attracted more extensive research and attention for its higher flux when compared to other membrane distillation process, and has more advantages in industrial application. The CFD numerical simulation method has been adopted in this paper to study the heat and mass transfer process of membrane surface in cross-flow hollow fiber VMD process with a 3D simulation model. The result shows that the distribution of velocity, temperature, heat transfer coefficient and evaporation rate on fiber surface changes with the local location, and these parameters have the similar distribution regulation. The biggest values are found between phase angle 60° to 90°, and the values around phase angle of 0° and 180° are very small. The bulk flow velocity can affect the distribution of heat and mass transfer parameters on the fiber surface dramatically, the evaporation rate and heat transfer coefficient improved with the increase of bulk velocity. But the heat transfer coefficient reduced rapidly with the increase of vacuum degree. This study will deepen the understanding of hollow fiber membrane distillation process and provide a guidance for the enhancement of membrane process.
Keywords： hollow fiber；   vacuum membrane distillation；   numerical simulation；   evaporation rate；   heat transfer coefficient     
Received 2015-05-27;
Fund:

天津市科技支撑计划项目（12ZCZDSF02200）。
Corresponding Authors: 李保安,E-mail:libaoan@tju.edu.cn。     Email: libaoan@tju.edu.cn
About author: 刘军(1988-),男,硕士研究生,从事膜蒸馏方面的研究。
引用本文:   
刘军, 李保安.减压膜蒸馏过程纤维膜表面热质传递特征模拟分析[J].  化学工业与工程, 2016,33(6): 80-87
Liu Jun, Li Baoan.Simulation Analysis of Heat and Mass Transfer on Fiber Surface in Vacuum Membrane Distillation Process[J].  Chemcial Industry and Engineering, 2016,33(6): 80-87
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