Behaviours of non-newtonian flow mechanism through hollow tube spinneret for hollow fiber membrane spinning process
The objective of this research is to study the behaviour of Non-newtonian flow for hollow fiber membrane spinning process. Inorganic membrane was chosen as the hollow fiber membrane material to be developed as it has certain advantage compared to organic hollow fiber membrane. Kaolin was selected a...
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| Format: | Research Report |
| Language: | en |
| Published: |
Universiti Malaysia Sabah
2013
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| Online Access: | https://eprints.ums.edu.my/id/eprint/22849/1/Behaviours%20of%20non%20newtonian%20flow%20mechanism%20through%20hollow%20tube%20spinneret%20for%20hollow%20fiber%20membrane%20spinning%20process.pdf https://eprints.ums.edu.my/id/eprint/22849/ |
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| Summary: | The objective of this research is to study the behaviour of Non-newtonian flow for hollow fiber membrane spinning process. Inorganic membrane was chosen as the hollow fiber
membrane material to be developed as it has certain advantage compared to organic hollow fiber membrane. Kaolin was selected as the primary material while Polyether Sulfone (PESt) was used as the binder agent, NMP was used as solvent in its original form. To decouple the effect of other spinning factors and isolate only to viscosity and spinneret dimension, the spinning was done using dry/wet spinning process without take-up mechanism. Then, the hollow fiber membrane underwent sintering process to remove the PESf binder from the ceramic structure. Scanning electron microscopy (SEM) method was used to characterize the
hollow fiber membrane structure. While spinning the hollow fiber membrane, kaolin suspension was extruded in a complicated channel within a tube-orifice spinneret. The
suspension will subject to shear stress which may Influence the fiber's formation, morphology and separation performance due to chain entanglement. Thus, CFD study was
conducted to simulate flow behavior in the spinneret and correlated with morphology of hollow fiber membrane. In this study, we found that the addition of kaolin onto PESf solution enhance the non-newtonian behavior and crossly resemblance the pseudo-plastic flow. Simulation data also shows that there is a high correlation between fluid stability and hollow fiber morphology. A much stable flow was observed at longer retention time in the spinneret annulus and the hollow fiber yields better structural integrity. Improvement made on spinneret design yields better concentricity structure on the hollow fiber as well. |
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