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Membrane Water Treatment
  Volume 7, Number 1, January 2016 , pages 71-86

Comparative study of air gap, direct contact and sweeping gas membrane distillation configurations
Nizar Loussif and Jamel Orfi

    The present study deals with a numerical simulation for the transport phenomena in three configurations of Membrane Distillation (Air Gap, Direct Contact and Sweeping Gas Membrane Distillation) usually used for desalination in order to make an objective comparison between them under the same operating conditions. The models are based on the conservation equations for the mass, momentum, energy and species within the feed saline and cooling solutions as well as on the mass and energy balances on the membrane sides. The theoretical model was validated with available data and was found in good agreement. DCMD configuration provided the highest pure water production while SGMD shows the highest thermal efficiency. Process parameters\' impact on each configuration are also presented and discussed.
Key Words
    desalination; membrane distillation; air gap; direct contact; sweeping gas
(1) Nizar Loussif:
Ecole Nationale d'Ingènieur de Monastir, Universitè de Monastir, Monastir, Tunisia;
(2) Nizar Loussif:
Unitè de Recherche Matèriaux, Energie et Energies Renouvelables, Facultè des Sciences Gafsa, Universitè de Gafsa, 2100 Gafsa, Tunisia;
(3) Jamel Orfi:
Department of Mechanical Engineering, College of Engineering, King Saud University, Riyadh, Saudi Arabia.

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