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@PHDTHESIS{Wypysek:861122,
      author       = {Wypysek, Denis Mathias},
      othercontributors = {Wessling, Matthias and Van der Meer, Walter G. J.},
      title        = {{V}isualization of complex flow phenomena in multichannel
                      membrane modules},
      volume       = {34(2023)},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {RWTH Aachen University},
      reportid     = {RWTH-2022-11651},
      series       = {Aachener Verfahrenstechnik series - AVT.CVT - chemical
                      process engineering},
      pages        = {1 Online-Ressource : Illustrationen, Diagramme},
      year         = {2022},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University 2023; Dissertation, Rheinisch-Westfälische
                      Technische Hochschule Aachen, 2022},
      abstract     = {Water povert and optimization of sustainable water
                      purification technologies is an essential research
                      objective. A growing field of interest in achieving current
                      and future challenges regarding water purification is
                      membrane technology. Recently, multibore geometries for
                      hollow fiber membranes have promised to overcome many
                      drawbacks of the single bore geometry, thus finding their
                      way into many applications such as drinking water production
                      and seawater desalination. In the past, several studies have
                      focused on optimizing their geometry and material, and
                      investigated flow distribution inside them. However, their
                      related permeation properties, such as fundamental
                      understanding of internal pathways and their hydrodynamic
                      operation conditions in modules, are still unknown. This
                      study aims to tackle these challenges by deepening the
                      understanding of multibore membrane filtration and
                      hydrodynamic effects in membrane modules. To achieve these
                      goals, the interconnection of magnetic resonance imaging
                      measurements and computational fluid dynamics simulations
                      allows investigating multichannel membrane modules at
                      different orders of magnitude: from a highly-packed membrane
                      module consisting of several multichannel membranes; to a
                      single membrane with and without a module as a housing;
                      toward a closer look into the dynamic wetting behavior of
                      the porous structure of each membrane. This thesis revealed
                      that small deviations from the ideal membrane position
                      inside a membrane module highly influence its flow field and
                      filtration behavior. A bent multichannel membrane introduces
                      secondary flows on the shell side, leading to drag forces
                      inside each lumen channel which influence particle fouling
                      behavior. Also, a simulation model with heterogeneously
                      distributed material properties was set up to model a
                      multichannel membrane correctly and, thus, internal flux
                      pathways. This model unraveled an unequal flow distribution
                      over the lumen's circumference, with higher velocities
                      closer to the membrane's outer skin. Moreover, the
                      investigation of highly-packed membrane modules showed
                      evolving jet streams on the shell side, which disturb the
                      equal flow distribution in all lumen channels. Finally,
                      wetting experiments of highly-packed modules revealed the
                      need for a wetting time of over six hours when wetting
                      membranes that are not pre-wetted. This study shows that the
                      combination of magnetic resonance imaging and computational
                      fluid dynamics is a powerful tool to unravel the
                      hydrodynamic behavior of multichannel membranes and modules
                      in full detail. Such information on membrane filtration
                      behavior allows optimizing membranes and membrane modules to
                      create a highly efficient and sustainable process for water
                      purification.},
      cin          = {416110},
      ddc          = {620},
      cid          = {$I:(DE-82)416110_20140620$},
      pnm          = {ConFluReM - Controlling Fluid Resistances at Membranes
                      (694946)},
      pid          = {G:(EU-Grant)694946},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      doi          = {10.18154/RWTH-2022-11651},
      url          = {https://publications.rwth-aachen.de/record/861122},
}