Modelling and simulation of drying process for ceramic membrane fabrication

For ages, ceramic properties and structure is known for its brittleness and its failure such as cracking and warping. This weakness also relates to the high sensitivity of ceramic to any thermal gradient effects. Therefore, processing steps of green body of ceramic is crucial especially in membra...

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Main Author:	Ong, Tze Ching
Format:	Thesis
Language:	English English English
Published:	2015
Subjects:	TP250-261 Industrial electrochemistry
Online Access:	http://eprints.uthm.edu.my/1613/1/24p%20ONG%20TZE%20CHING.pdf http://eprints.uthm.edu.my/1613/2/ONG%20TZE%20CHING%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1613/3/ONG%20TZE%20CHING%20WATERMARK.pdf
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spelling	my-uthm-ep.16132021-10-04T01:03:09Z Modelling and simulation of drying process for ceramic membrane fabrication 2015-07 Ong, Tze Ching TP250-261 Industrial electrochemistry For ages, ceramic properties and structure is known for its brittleness and its failure such as cracking and warping. This weakness also relates to the high sensitivity of ceramic to any thermal gradient effects. Therefore, processing steps of green body of ceramic is crucial especially in membrane fabrication that has a multilayer structure to ensure the efficiency of its applications. Thus, every step of ceramic membrane preparation and fabrication needs careful control and monitoring to fulfil these aims. Drying is one of the main problems that is always associated with the cracks and leakages of the ceramic membrane. In fact, the drying process is one of the longest steps corresponding to various evolutions of parameters during the evaporation process. Due to the limitation in experimental or empirical ability to determine the changes of dynamic critical variables during drying, modelling and simulation seems to be the right option to determine and investigate these nonlinear and dynamic variables and will be the focus of this study. This two-dimensional mathematical modelling approach is able to predict the changes of variables in heat and mass transfer during the drying process. The governing system of fully coupled non-linear partial differential equations of the model was derived from a mechanistic approach where the mass and energy conservation laws are defined for a particular phase into which Darcy’s law and Fick’s law are substituted. A fully implicit algorithm has been employed for numerical solution using the finite element method in which the Galerkin weighted residual method is used in the spatial discretization and a backward finite difference time-stepping scheme is employed for time integration. The ability of this improved model is not restricted to a single homogenous layer of hygroscopic and nonhygroscopic material, but on the novelty to incorporate multilayer heterogeneous material properties as a membrane structure. A good agreement obtained by respective validation works suggested that the model development and implementation are satisfactory. Subsequently, case studies involving single layer and multilayer have produced reasonable accuracy at all times. The application of the model at various case studies involves a convective and enhanced intermittent drying mode which demonstrates the robustness and trustworthiness in predicting and optimising the drying process. 2015-07 Thesis http://eprints.uthm.edu.my/1613/ http://eprints.uthm.edu.my/1613/1/24p%20ONG%20TZE%20CHING.pdf text en public http://eprints.uthm.edu.my/1613/2/ONG%20TZE%20CHING%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/1613/3/ONG%20TZE%20CHING%20WATERMARK.pdf text en validuser phd doctoral Universiti Tun Hussein Onn Malaysia Faculty of Mechanical and Manufacturing Engineering
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English English
topic	TP250-261 Industrial electrochemistry
spellingShingle	TP250-261 Industrial electrochemistry Ong, Tze Ching Modelling and simulation of drying process for ceramic membrane fabrication
description	For ages, ceramic properties and structure is known for its brittleness and its failure such as cracking and warping. This weakness also relates to the high sensitivity of ceramic to any thermal gradient effects. Therefore, processing steps of green body of ceramic is crucial especially in membrane fabrication that has a multilayer structure to ensure the efficiency of its applications. Thus, every step of ceramic membrane preparation and fabrication needs careful control and monitoring to fulfil these aims. Drying is one of the main problems that is always associated with the cracks and leakages of the ceramic membrane. In fact, the drying process is one of the longest steps corresponding to various evolutions of parameters during the evaporation process. Due to the limitation in experimental or empirical ability to determine the changes of dynamic critical variables during drying, modelling and simulation seems to be the right option to determine and investigate these nonlinear and dynamic variables and will be the focus of this study. This two-dimensional mathematical modelling approach is able to predict the changes of variables in heat and mass transfer during the drying process. The governing system of fully coupled non-linear partial differential equations of the model was derived from a mechanistic approach where the mass and energy conservation laws are defined for a particular phase into which Darcy’s law and Fick’s law are substituted. A fully implicit algorithm has been employed for numerical solution using the finite element method in which the Galerkin weighted residual method is used in the spatial discretization and a backward finite difference time-stepping scheme is employed for time integration. The ability of this improved model is not restricted to a single homogenous layer of hygroscopic and nonhygroscopic material, but on the novelty to incorporate multilayer heterogeneous material properties as a membrane structure. A good agreement obtained by respective validation works suggested that the model development and implementation are satisfactory. Subsequently, case studies involving single layer and multilayer have produced reasonable accuracy at all times. The application of the model at various case studies involves a convective and enhanced intermittent drying mode which demonstrates the robustness and trustworthiness in predicting and optimising the drying process.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Ong, Tze Ching
author_facet	Ong, Tze Ching
author_sort	Ong, Tze Ching
title	Modelling and simulation of drying process for ceramic membrane fabrication
title_short	Modelling and simulation of drying process for ceramic membrane fabrication
title_full	Modelling and simulation of drying process for ceramic membrane fabrication
title_fullStr	Modelling and simulation of drying process for ceramic membrane fabrication
title_full_unstemmed	Modelling and simulation of drying process for ceramic membrane fabrication
title_sort	modelling and simulation of drying process for ceramic membrane fabrication
granting_institution	Universiti Tun Hussein Onn Malaysia
granting_department	Faculty of Mechanical and Manufacturing Engineering
publishDate	2015
url	http://eprints.uthm.edu.my/1613/1/24p%20ONG%20TZE%20CHING.pdf http://eprints.uthm.edu.my/1613/2/ONG%20TZE%20CHING%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/1613/3/ONG%20TZE%20CHING%20WATERMARK.pdf
_version_	1747830829462061056

Modelling and simulation of drying process for ceramic membrane fabrication

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