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dc.contributor.authorKaranikola, Vasiliki
dc.contributor.authorCorral, Andrea F.
dc.contributor.authorJiang, Hua
dc.contributor.authorSáez, A. Eduardo
dc.contributor.authorEla, Wendell P.
dc.contributor.authorArnold, Robert G.
dc.date.accessioned2017-04-07T17:22:59Z
dc.date.available2017-04-07T17:22:59Z
dc.date.issued2017
dc.identifier.citationVasiliki Karanikola, Andrea F. Corral, Hua Jiang, A. Eduardo Sáez, Wendell P. Ela, Robert G. Arnold, Effects of membrane structure and operational variables on membrane distillation performance, Journal of Membrane Science, Volume 524, 15 February 2017, Pages 87-96en
dc.identifier.doi10.1016/j.memsci.2016.11.038
dc.identifier.urihttp://hdl.handle.net/10150/623056
dc.description.abstractA bench-scale, sweeping gas, flat-sheet Membrane Distillation (MD) unit was used to assess the importance of membrane architecture and operational variables to distillate production rate. Sweeping gas membrane distillation (SGMD) was simulated for various membrane characteristics (material, pore size, porosity and thickness), spacer dimensions and operating conditions (influent brine temperature, sweep gas flow rate and brine flow rate) based on coupled mass and energy balances. Model calibration was carried out using four membranes that differed in terms of material selection, effective pore size, thickness and porosity. Membrane tortuosity was the lone fitting parameter. Distillate fluxes and temperature profiles from experiments matched simulations over a wide range of operating conditions. Limitations to distillate production were then investigated via simulations, noting implications for MD design and operation. Under the majority of conditions investigated, membrane resistance to mass transport provided the primary limitation to water purification rate. The nominal or effective membrane pore size and the lumped parameter epsilon/delta tau (porosity divided by the product of membrane tortuosity and thickness) were primary determinants of membrane resistance to mass transport. Resistance to Knudsen diffusion dominated membrane resistance at pore diameters <0.3 mu m. At larger pore sizes, a combination of resistances to intra-pore molecular diffusion and convection across the gas-phase boundary layer determined mass transport resistance. Findings are restricted to the module design flow regimes considered in the modeling effort. Nevertheless, the value of performance simulation to membrane distillation design and operation is well illustrated.
dc.description.sponsorshipUS Bureau of Reclamation [R10AC32089]; Water, Environmental, and Energy Solutions Program (University of Arizona); Salt River Projecten
dc.language.isoenen
dc.publisherELSEVIER SCIENCE BVen
dc.rightsCopyright © 2021 Elsevier B.V. All rights reserved.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectSweeping gas membrane distillationen
dc.subjectDesalinationen
dc.subjectFlat sheet membraneen
dc.subjectHeat and mass transferen
dc.titleEffects of membrane structure and operational variables on membrane distillation performanceen
dc.typeArticleen
dc.contributor.departmentDepartment of Chemical and Environmental Engineering, The University of Arizonaen
dc.identifier.journalJournal of Membrane Scienceen
dc.description.note24 month embargo; Available online 17 November 2016en
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en
dc.eprint.versionFinal accepted manuscripten
html.description.abstractA bench-scale, sweeping gas, flat-sheet Membrane Distillation (MD) unit was used to assess the importance of membrane architecture and operational variables to distillate production rate. Sweeping gas membrane distillation (SGMD) was simulated for various membrane characteristics (material, pore size, porosity and thickness), spacer dimensions and operating conditions (influent brine temperature, sweep gas flow rate and brine flow rate) based on coupled mass and energy balances. Model calibration was carried out using four membranes that differed in terms of material selection, effective pore size, thickness and porosity. Membrane tortuosity was the lone fitting parameter. Distillate fluxes and temperature profiles from experiments matched simulations over a wide range of operating conditions. Limitations to distillate production were then investigated via simulations, noting implications for MD design and operation. Under the majority of conditions investigated, membrane resistance to mass transport provided the primary limitation to water purification rate. The nominal or effective membrane pore size and the lumped parameter epsilon/delta tau (porosity divided by the product of membrane tortuosity and thickness) were primary determinants of membrane resistance to mass transport. Resistance to Knudsen diffusion dominated membrane resistance at pore diameters <0.3 mu m. At larger pore sizes, a combination of resistances to intra-pore molecular diffusion and convection across the gas-phase boundary layer determined mass transport resistance. Findings are restricted to the module design flow regimes considered in the modeling effort. Nevertheless, the value of performance simulation to membrane distillation design and operation is well illustrated.


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