Hollow fiber membrane terminology: (a) Schematic of a spinneret for membrane production. (b) Scanning electron microscopy cross section of a hollow fiber membrane with circular lumen and shell side.

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... fiber membranes are commonly produced by utilizing a phase inversion process, where a liquid polymer solution is pumped through a ring gap with a non-solvent solution ("Borefluid") in the center (Figure 1a) [4]. Adjustment of the spinneret allows for a microstructured lumen or shell side of a fiber (Figure 1b). ...

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... fiber membranes are commonly produced by utilizing a phase inversion process, where a liquid polymer solution is pumped through a ring gap with a non-solvent solution ("Borefluid") in the center (Figure 1a) [4]. Adjustment of the spinneret allows for a microstructured lumen or shell side of a fiber (Figure 1b). A number of studies altered the lumen geometry of hollow fibers either by directly adjusting the spinneret [5] or spinning the lumen geometry of hollow fibers either by directly adjusting the spinneret [5] or spinning parameters [6]. ...

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... (b) Figure 1. Hollow fiber membrane terminology: (a) Schematic of a spinneret for membrane production. ...

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... the lowest velocity category, we find the modal value of all geometries between 0.005 and 0.006 m/s for this Reynolds number. As a visual comparison of the flow fields, CFD velocity contour plots of all geometries are given in Appendix A ( Figure A1) for Re 0.8. Employing Equation (11), we calculate a theoretical module performance for different oxygenator volumes at Re 0.8 ( Figure 8). ...

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... however, due to the height of the channel (1 mm), this variation caused only minor changes in the results and was therefore deemed negligible for this investigation. Both the experimental (Figure 5a) and numerical ( Figure A1a) velocity contour plots show high velocities between the fibers in the flow direction, and low velocity regions perpendicular to the flow. This influences the velocity gradient along the membrane surface, which in turn influences the Sherwood number. ...

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... at the CFD contour plots of the velocity flow fields ( Figure A1), low-velocity zones are found around the fibers and inside the amplitudes. Using the local Sherwood number calculated on the membrane surface, we can visualize this observation by plotting along the circumference of a single fiber (Figure 9). ...

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... at the CFD contour plots of the velocity flow fields (Figure A1), low-velocity zones are found around the fibers and inside the amplitudes. Using the local Sherwood number calculated on the membrane surface, we can visualize this observation by plotting along the circumference of a single fiber (Figure 9). ...