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@INPROCEEDINGS{Unije:838683,
      author       = {Unije, Unoaku Victoria and Mücke, Robert and
                      Schulze-Küppers, Falk and Baumann, Stefan and Guillon,
                      Olivier},
      title        = {{O}ptimization of the porous support of an asymmetric
                      oxygen transport membrane by numerical modelling},
      school       = {RWTH Aachen},
      reportid     = {FZJ-2017-07249},
      year         = {2017},
      abstract     = {Asymmetric oxygen transport membranes (OTM) provide a low
                      ionic resistance of the functional separation layer together
                      with a high mechanical stability. Hence, they are promising
                      candidates for high-permeation in a variety of
                      high-temperature applications for the separation of oxygen
                      from gas mixtures. However, the microstructure of the porous
                      support in the membrane assembly affects the overall flux
                      significantly [1].In this work, the optimization of the
                      porous support was studied by simulating numerically the
                      effect of geometrical changes (pore size, pore geometry,
                      substrate thicknesses) of the support on the overall flux,
                      using different flow conditions (3-end, 4-end), and assembly
                      orientation [2]. These effects were studied by applying the
                      binary friction model (BFM) for the support together with a
                      modified Wagner equation for the dense membrane using
                      transport relevant parameters obtained from micro computed
                      tomography data of a BSCF-Z support. Additionally, the
                      effect of the support geometry and the depth of travel of
                      the sweep gas on the permeated flux were investigated by
                      computational fluid dynamics using Ansys Fluent. From the
                      CFD simulation, u-shaped pores are more desirable for
                      inverse tape cast porous support and enables quick removal
                      of the permeated gas. Supports with elongated pores would be
                      ideal for 4-end mode (binary diffusion limited
                      configurations/gas mixtures e.g. membrane reactors)
                      transport, while for oxygen generation from air (3-end),
                      supports with either compressed or elongated pores are
                      comparable (rel. difference < $~7\%).$ A relationship
                      between the opposing factors substrate thickness and pore
                      size was developed that ensures a given flux. This can be
                      used to optimize support’s microstructure with regards to
                      mechanical strength and permeability. [1] P. Niehoff, et al.
                      Oxygen transport through supported
                      Ba0.5Sr0.5Co0.8Fe0.2O3–d membranes, Sep.Purif Technol,
                      121(2014)60-67.[2] U. Unije, et al. Simulation of the effect
                      of the porous support on flux through an asymmetric oxygen
                      transport membrane, J.Membrane Sci., 524(2017)334-343.},
      month         = {Jul},
      date          = {2017-07-29},
      organization  = {2017 International Congress on
                       Membranes and Membrane Processes, San
                       Francisco (USA), 29 Jul 2017 - 4 Aug
                       2017},
      subtyp        = {After Call},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113) / HITEC - Helmholtz Interdisciplinary Doctoral
                      Training in Energy and Climate Research (HITEC)
                      (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-113 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/838683},
}