Heat and mass transfer in membrane distillation used for desalination with slip flow


A theoretical model for the transport phenomena in an air gap membrane distillation is presented. The model is based on the conservation equations for the mass, momentum, energy and species within the feed water solution as well as on the mass and energy balances on the membrane sides. The slip flow occurs due to the hydrophobic properties of the membrane. The slip boundary condition applied on the feed saline solution-membrane interface is taken into consideration showing its effects on process parameters particularly permeate flow, heat transfer coefficient and thermal efficiency. The theoretical model was validated with available experimental data and was found to be in good agreement especially when the slip condition is introduced. Increasing slip length from zero to 200 μm was found to increase the permeate flux and the thermal efficiency by 33% and 1.7% respectively.

Publication DOI: https://doi.org/10.1016/j.desal.2015.12.009
Divisions: Engineering & Applied Sciences > Mechanical Engineering & Design
Engineering & Applied Sciences > Sustainable environment research group
Engineering & Applied Sciences > Aston Institute of Materials Research (AIMR)
Additional Information: © 2015, Elsevier. Licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International http://creativecommons.org/licenses/by-nc-nd/4.0/
Uncontrolled Keywords: desalination,membrane distillation,modeling,simulation,slip flow,Chemical Engineering(all),Mechanical Engineering,Chemistry(all),Materials Science(all),Water Science and Technology
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2016-03-01
Published Online Date: 2015-12-24
Accepted Date: 2015-12-14
Authors: Orfi, Jamel
Loussif, Nizar
Davies, Philip A. ( 0000-0003-4783-1234)

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