Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane

Inorganic hollow fibre membrane is normally made from premium ceramics which is not easy to procure. Furthermore, the process of producing ceramic membrane requires the ceramic precursor to undergoes sintering process at high temperature. Thus, the cost of developing a ceramic membrane using experim...

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Main Author:	Mohd Suffian Misaran @ Misran
Format:	Thesis
Language:	English English
Published:	2017
Subjects:	TA401-492 Materials of engineering and construction Mechanics of materials
Online Access:	https://eprints.ums.edu.my/id/eprint/37666/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/37666/2/FULLTEXT.pdf
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spelling	my-ums-ep.376662023-11-29T02:01:02Z Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane 2017 Mohd Suffian Misaran @ Misran TA401-492 Materials of engineering and construction. Mechanics of materials Inorganic hollow fibre membrane is normally made from premium ceramics which is not easy to procure. Furthermore, the process of producing ceramic membrane requires the ceramic precursor to undergoes sintering process at high temperature. Thus, the cost of developing a ceramic membrane using experimental method is expensive. Kaolin have been identified as an alternative ceramic material while offering reasonable cost. However, knowledge on kaolin as base material for hollow fibre membrane are still in its infancy and much are not yet known. Thus, this study aims to produce asymmetrical Kaolin/Polyethersulfone (PESf) hollow fibre membrane with thin outer finger-like region by observing shear experience within the spinneret in relation to hollow fibre formation and morphology. The research work is executed in three phase; kaolin solution formulation, spinning and characterization, CFD simulation. Kaolin solutions formulated using Polyethersulfone (PESf) as binder and N-methyl-2-pyrrolidone (NMP) as solvent were rheologically assessed using a rotational viscometer to obtain the values of power law coefficients, n and k. These rheological data are then correlated with the characteristic of the hollow fibre membrane, essentially hollow fibre morphology and porosity. The shear rate inside the spinneret annulus is obtained using computational fluid dynamics (CFD) method. Rheology investigation shows that Kaolin suspension exhibits non-Newtonian behavior under the power law scheme. An increase in the Kaolin/PESf ratio further increases the viscous behavior of the non-Newtonian liquid. The power law coefficients for the Kaolin suspension were successfully determine and is used in the computational fluid dynamic analysis. Morphology study on spun hollow fibre shows asymmetric structure. The study also indicates that there is a strong link between extrusion shear to precipitation rate. It is found membrane spun at low shear experience of 109.55 s-1 have thin outer finger like region at 24% area ratio and porosity of 68%. Increasing the shear experience in the annulus outer wall; affects the apparent viscosity and ultimately causing the precipitation rate to increase and grows the outer finger-like region. At shear experience of 2155. 78 s-1, outer finger like region is at 48% and membrane porosity at 48%. This study established that rheology characteristic of the kaolin suspension plays an important role to the shear experience behavior in the spinneret annulus. Ultimately, correlation of the shear experience and hollow fibre morphology enable us to predict hollow fibre performance in the design process reducing the overall development cost. 2017 Thesis https://eprints.ums.edu.my/id/eprint/37666/ https://eprints.ums.edu.my/id/eprint/37666/1/24%20PAGES.pdf text en public https://eprints.ums.edu.my/id/eprint/37666/2/FULLTEXT.pdf text en validuser dphil doctoral Universiti Malaysia Sabah Fakulti Kejuruteraan
institution	Universiti Malaysia Sabah
collection	UMS Institutional Repository
language	English English
topic	TA401-492 Materials of engineering and construction Mechanics of materials
spellingShingle	TA401-492 Materials of engineering and construction Mechanics of materials Mohd Suffian Misaran @ Misran Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
description	Inorganic hollow fibre membrane is normally made from premium ceramics which is not easy to procure. Furthermore, the process of producing ceramic membrane requires the ceramic precursor to undergoes sintering process at high temperature. Thus, the cost of developing a ceramic membrane using experimental method is expensive. Kaolin have been identified as an alternative ceramic material while offering reasonable cost. However, knowledge on kaolin as base material for hollow fibre membrane are still in its infancy and much are not yet known. Thus, this study aims to produce asymmetrical Kaolin/Polyethersulfone (PESf) hollow fibre membrane with thin outer finger-like region by observing shear experience within the spinneret in relation to hollow fibre formation and morphology. The research work is executed in three phase; kaolin solution formulation, spinning and characterization, CFD simulation. Kaolin solutions formulated using Polyethersulfone (PESf) as binder and N-methyl-2-pyrrolidone (NMP) as solvent were rheologically assessed using a rotational viscometer to obtain the values of power law coefficients, n and k. These rheological data are then correlated with the characteristic of the hollow fibre membrane, essentially hollow fibre morphology and porosity. The shear rate inside the spinneret annulus is obtained using computational fluid dynamics (CFD) method. Rheology investigation shows that Kaolin suspension exhibits non-Newtonian behavior under the power law scheme. An increase in the Kaolin/PESf ratio further increases the viscous behavior of the non-Newtonian liquid. The power law coefficients for the Kaolin suspension were successfully determine and is used in the computational fluid dynamic analysis. Morphology study on spun hollow fibre shows asymmetric structure. The study also indicates that there is a strong link between extrusion shear to precipitation rate. It is found membrane spun at low shear experience of 109.55 s-1 have thin outer finger like region at 24% area ratio and porosity of 68%. Increasing the shear experience in the annulus outer wall; affects the apparent viscosity and ultimately causing the precipitation rate to increase and grows the outer finger-like region. At shear experience of 2155. 78 s-1, outer finger like region is at 48% and membrane porosity at 48%. This study established that rheology characteristic of the kaolin suspension plays an important role to the shear experience behavior in the spinneret annulus. Ultimately, correlation of the shear experience and hollow fibre morphology enable us to predict hollow fibre performance in the design process reducing the overall development cost.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mohd Suffian Misaran @ Misran
author_facet	Mohd Suffian Misaran @ Misran
author_sort	Mohd Suffian Misaran @ Misran
title	Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
title_short	Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
title_full	Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
title_fullStr	Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
title_full_unstemmed	Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
title_sort	shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane
granting_institution	Universiti Malaysia Sabah
granting_department	Fakulti Kejuruteraan
publishDate	2017
url	https://eprints.ums.edu.my/id/eprint/37666/1/24%20PAGES.pdf https://eprints.ums.edu.my/id/eprint/37666/2/FULLTEXT.pdf
_version_	1794022677643526144

Shear rate effect on asymmetric kaolin-polyethersulfone hollow fibre membrane

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