CFD Analysis of Spacer-Obstructed Channels in Membrane Distillation
(English)Manuscript (preprint) (Other academic)
Spacers are used in desalination and filtration technologies to enhance the hydrodynamic conditions in flow channels, as well as to provide support and separation of membrane sheets. This paper present the main results of computational fluid dynamics (CFD) simulation for flow in spacer-obstructed flow channel for application in membrane distillation (MD). Flow of attack angle, spacer-to-channel thickness and void ratio were the main geometrical parameters that were studied; velocity profiles, shear stress and pressure drops were the main assessment criteria used for evaluation. Results show the flow of attack angle has a very minimum effect on the performance of spacers. The effect of spacer to channel thickness ratio was significant in all assessment parameters. Higher void ratios were found advantageous in promoting flow mixing, but resulted in lower sheer stress and reduced trans-membrane flux. In practice, the selection of the best case would include a trade-off between the cost of membranes needed to produce the required production and pumping.
CFD, Membrane Distillation, sheer stress, pressure drop
Energy Engineering Water Engineering
IdentifiersURN: urn:nbn:se:kth:diva-44482OAI: oai:DiVA.org:kth-44482DiVA: diva2:450583
QS 2011. Manuscript to be submitted to Journal of Membrane Science2011-10-212011-10-212011-10-21Bibliographically approved