Experimental and theoretical analyses of temperature polarization effect in vacuum membrane distillation

Ahmad S. Alsaadi, Lijo Francis, Gary L. Amy, Noreddine Ghaffour
2014 Journal of Membrane Science  
This paper discusses the effect of temperature polarization in Vacuum Membrane Distillation (VMD). The main motivation for using VMD in this work is that this module configuration is much simpler and more suitable for this kind of investigation than the other MD configurations such as Direct Contact Membrane Distillation (DCMD). The coupling between heat and mass transfer mechanisms at the feed-membrane interface is presented from a theoretical point of view. In addition, a new simple graphical
more » ... method and a mathematical model for determining VMD flux are presented. The two methods used in evaluating the extent of temperature polarization effect on water vapor flux (flux sensitivity factors and Temperature Polarization Coefficient (TPC)) are also analyzed and compared. The effect of integrating a heat recovery system in a large scale module on the TPC coefficient has also been studied and presented in this paper. Highlights • This work focused on studying the temperature polarization (TP) effect on flux in VMD • Experimental data were used to validate the developed mathematical model • Accurate prediction was achieved • Flux sensitivity factors and TP Coefficient (TPC) are analyzed and compared • The effect of TP was also studied for large scale modules having heat recovery system
doi:10.1016/j.memsci.2014.08.005 fatcat:b5tdj2hstvfmveeu6rmber5ol4