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Chemcial Industry and Engineering 2016, Vol. 33 Issue (6) :80-87    DOI: 10.13353/j.issn.1004.9533.20151085
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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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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.
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Liu Jun
Li Baoan
Keywords： hollow fiber；   vacuum membrane distillation；   numerical simulation；   evaporation rate；   heat transfer coefficient     
Received 2015-05-27;
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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,V33(6): 80-87
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