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dc.contributor.authorQamar, Adnan
dc.contributor.authorBucs, Szilard
dc.contributor.authorPicioreanu, Cristian
dc.contributor.authorVrouwenvelder, Johannes S.
dc.contributor.authorGhaffour, NorEddine
dc.date.accessioned2019-07-22T12:10:17Z
dc.date.available2019-07-22T12:10:17Z
dc.date.issued2019-07-19
dc.identifier.citationQamar, A., Bucs, S., Picioreanu, C., Vrouwenvelder, J., & Ghaffour, N. (2019). Hydrodynamic flow transition dynamics in a spacer filled filtration channel using direct numerical simulation. Journal of Membrane Science, 590, 117264. doi:10.1016/j.memsci.2019.117264
dc.identifier.doi10.1016/j.memsci.2019.117264
dc.identifier.urihttp://hdl.handle.net/10754/656154
dc.description.abstractA vital component of spiral-wound membrane modules is the spacer mesh. It not only structurally supports the membranes but also aids in mass-transport enhancement through the membrane surface. Fundamental understanding of hydrodynamics associated with these spacer designs is critical to improve the permeate flux performance by decreasing concentration polarization and minimizing (bio)fouling, as well as minimizing the axial pressure drop. In the present study, time and space resolved Direct Numerical Simulations (DNS) were performed for a commercial spacer geometry. The spacer geometry was reconstructed by measurements using Scanning Electron Microscopy (SEM). Computations were performed for three spacer cells, allowing elimination of stream-wise periodicity that was a major bottleneck in earlier studies. The numerical solver was well checked in terms of boundary layer profiles obtained from Particle Image Velocimetry (PIV) data and with pressure measurements corresponding to various flow channel velocities. Non-dimensional computations were performed for Reynolds Numbers (Re) ranging from 73 to 375 (inlet channel velocity of 0.073–0.375 m/s) covering the flow transition dynamics regime. Results indicate that flow transition from steady to unsteady regime occurs for Re > 250. The flow transition could be primarily attributed to the interaction between vortices attached to the spacer filaments and the screw-vortex that originates along the diagonal of the spacer cells. No turbulent transition was observed even at the highest investigated velocity (Re = 375). The frequency spectra of time-varying velocity signal shows that at Re > 350 a sudden shift of frequency spectra occurs from discrete to continuous mode indicating the onset of advanced instability. Spacer design criteria in terms of maximum principal stress is also proposed, which can potentially aid in minimizing biofilm seeding.
dc.description.sponsorshipThe research reported in this paper was supported by funding from King Abdullah University of Science and Technology (KAUST), Saudi Arabia. The authors also like to thank KAUST Supercomputing Laboratory (KSL) team for space allocation and technical support for solver porting, testing and scaling studies.
dc.publisherElsevier BV
dc.relation.urlhttps://linkinghub.elsevier.com/retrieve/pii/S0376738819306064
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Journal of Membrane Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Membrane Science, [[Volume], [Issue], (2019-07-19)] DOI: 10.1016/j.memsci.2019.117264 . © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
dc.subjectDesalination
dc.subjectUnsteady hydrodynamics
dc.subjectDirect numerical simulations (DNS)
dc.subjectVortex dynamics
dc.subjectComputational fluid dynamics (CFD)
dc.subjectSpacer design
dc.titleHydrodynamic flow transition dynamics in a spacer filled filtration channel using direct numerical simulation
dc.typeArticle
dc.contributor.departmentBiological and Environmental Sciences and Engineering (BESE) Division
dc.contributor.departmentEnvironmental Science and Engineering
dc.contributor.departmentEnvironmental Science and Engineering Program
dc.contributor.departmentWater Desalination & Reuse Center
dc.contributor.departmentWater Desalination and Reuse Research Center (WDRC)
dc.identifier.journalJournal of Membrane Science
dc.rights.embargodate2021-07-19
dc.eprint.versionPost-print
dc.contributor.institutionDepartment of Biotechnology, Faculty of Applied Sciences, Delft University of Technology, Van der Maasweg 9, 2629 HZ, Delft, the Netherlands
kaust.personQamar, Adnan
kaust.personBucs, Szilard
kaust.personVrouwenvelder, Johannes S.
kaust.personGhaffour, Noreddine
kaust.acknowledged.supportUnitSupercomputing Laboratory
dc.date.published-online2019-07-19
dc.date.published-print2019-07


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