A CFD study of the effect of module length on temperature polarization in a Direct Contact Membrane Distillation (DCMD) process for laminar flow
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1Membrane Processes Research Laboratory (MPRL), Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic)
2Department of Chemical Engineering, Amirkabir University of Technology (Tehran Polytechnic)
3Chemical Engineering Department, Tarbiat Modares University, Tehran, Iran
For achieving a successful membrane distillation, not only the membrane performance but also the module design is important. An acceptable membrane must have a high salt rejection along with a high permeate flux. Since the driving force for membrane distillation is a temperature gradient across the porous hydrophobic membrane, the temperature polarization could affect the system performance considerably. Computational Fluid Dynamics (CFD) is a powerful tool for the investigation of the temperature polarization in a membrane module. In this research, the effects of module length on the temperature polarization coefficients (TPC) is investigated. The results showed that an increase in the module length results in a decreased temperature polarization and higher TPC. However, there is optimum module length value for attaining an optimum DCMD operation.