The Effect of Module Geometry on Heat and Mass Transfer in Membrane Distillation
Paper ID : 1157-MST2015-FULL
Hossein Ahadi1, Javad Karimi-Sabet *2, Mojtaba Shariaty-Niassarar3
1aSchool of Chemical Eng., College of Eng., University of Tehran, Tehran, Iran
2P.O.Box: 14395-983, Tehran, Iran.
3Transport Phenomena & Nanotech. Lab, University College of Engineering, University of Tehran, Tehran, Iran
Some features of Direct Contact Membrane Distillation (DCMD), as one of interesting membrane processes, has been studied in this effort. 3D computational fluid dynamic simulations were carried out to investigate some geometric parameter effects on flat sheet membrane module performance. It’s obvious that using of baffles could noticeably improve the performance of the system. In present work, some baffle configurations were simulated and some parameters like temperature polarization, vapor flux and pressure drop through module length were compared. The Simulation was performed based on neglecting viscous flow in membrane pores and dusty gas model was applied to predict vapor flux through membrane.
Simulation results predicted 40-60% improvement (depend on inflow velocity) for vapor flux compared to a module without baffle. It was found that the average temperature polarization (TP), as a proper criteria, was higher for baffled one in all situations.
CFD, Membrane distillation, Module design, baffle.
Status : Paper Accepted (Poster Presentation)