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FROM: Jun Yin, Nicole Coutris and Young Huang (Dept. of Mechanical Engineering, Clemson Universtiy, Clemson, South Carolina),
“Investigation of inner surface groove formation under radially inward pressure during immersion precipitation-based hollow fiber membrane fabrication”, ASME Journal of Manufacturing Science and Engineering, Vol. 133, June 2011, DOI: 10.1115/1.4003950
ABSTRACT: Axially aligned grooves can be formed on the hollow fiber membrane (HFM) inner surface under some controlled fabrication conditions during a typical immersion precipitation- based phase inversion fabrication process. Such grooved HFMs are finding promising medical applications for nerve repair and regeneration. For better nerve regeneration per- formance, the HFM groove geometry should be carefully controlled. Towards this goal, in this study the polyacrylonitrile (PAN) HFM groove number has been modeled based on the radially inward pressure-induced buckling mechanism. HFM has been modeled as a long six-layer fiber membrane, and the HFM inner skin layer has been treated as a thin-walled elastic cylindrical shell under the shrinkage-induced inward radial pressure. The groove number has been reasonably estimated based on the resulting buckling mode as compared with the experimental measurements.
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