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1 Department of Physics, Technical University of Denmark 2 Biophysics and Fluids, Department of Physics, Technical University of Denmark 3 University of Copenhagen 4 Urban Water Engineering, Department of Environmental Engineering, Technical University of Denmark 5 DHI Denmark 6 Singapore Membrane Technology Centre 7 Niels Bohr Institute 8 Department of Environmental Engineering, Technical University of Denmark
In forward osmosis (FO), an osmotic pressure gradient generated across a semi-permeable membrane is used to generate water transport from a dilute feed solution into a concentrated draw solution. This principle has shown great promise in the areas of water purification, wastewater treatment, seawater desalination and power generation. To ease optimization and increase understanding of membrane systems, it is desirable to have a comprehensive model that allows for easy investigation of all the major parameters in the separation process. Here we present experimental validation of a computational fluid dynamics (CFD) model developed to simulate FO experiments with asymmetric membranes. Simulations are compared with experimental results obtained from using two distinctly different complex three-dimensional membrane chambers. It is found that the CFD model accurately describes the solute separation process and water permeation through membranes under various flow conditions. It is furthermore demonstrated how the CFD model can be used to optimize membrane geometry in such as way as to promote the mass transfer. © 2012 by the authors; licensee MDPI, Basel, Switzerland.
Membranes, 2012, Vol 2, Issue 4, p. 764-782
Computational fluid dynamics; Desalination; Membranes; Optimization; Osmosis; Polarization; Seawater; Three dimensional computer graphics; Wastewater treatment; Water filtration; Water supply; Wave power; Three dimensional
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