|dc.contributor.author||Griffani, Danielle Stephanie||-|
|dc.description.abstract||This thesis deals with the flow and transfer properties of a generic class of materials found in fields as diverse as geology and biology. We consider their common denominators: a fracture network that confines a flow and penetrates a matrix; and the mechanisms driving the heat or mass transfers between the fractures and matrix, namely, diffusion in the matrix and coupled advection-diffusion in the fractures.
A central problem for numerous applications is how the fracture network ‘microstructure’, which embodies a range of geometrical and topological attributes, influences the flow and transfer dynamics. Moreover, various mechanisms that clog or damage a material’s fractures, referred to as ‘attacks’, rapidly perturb its microstructure and redistribute the flow. The consequences of these attacks for the dynamics are important, yet challenging to predict. Addressing both of these issues forms the key aim of this thesis.
By adopting an ab initio approach and specifically developed numerical tools, we probe and measure the effect of various microstructural characteristics and attacks, on the macroscopic flow and transfer properties of fractured materials. Analytical techniques are applied to rationalise each set of results.
We find a new expression to determine tortuosity which, combined with the Kozeny-Carman equation, clarifies the impact of the fracture network topology and geometry on the permeability. Analogously, we also develop a unique function that distils the impact of the microstructure on the macroscopic transfer properties through its dependence on the Péclet number and dimensionless matrix island size. This function successfully captures the transfer dynamics of a variety of fractured materials of differing complexity over a wide range of geometrical, topological, material and kinematic attributes.
Finally, the core result of this work is a novel framework capable of predicting the vulnerability of the macroscopic flow and transfer properties of fractured materials to different types and extent of network attacks.
Together, our work serves as a common basis to analyse flow and transfers in specific fractured materials such as geothermal reservoirs, aquifers, plant hydraulic systems, microfluidic devices, and engineered tissues.
This thesis is a thesis by publication, built on four papers.||en_AU|
|dc.publisher||University of Sydney||en_AU|
|dc.publisher||Faculty of Engineering and IT||en_AU|
|dc.publisher||School of Civil Engineering||en_AU|
|dc.rights||The author retains copyright of this thesis. It may only be used for the purposes of research and study. It must not be used for any other purposes and may not be transmitted or shared with others without prior permission.||en_AU|
|dc.subject.other||POST DG EXPORT SUBMISSION||en_AU|
|dc.subject.other||! includes published articles||en_AU|
|dc.title||Flow and transfer in fractured materials||en_AU|
|dc.type.pubtype||Doctor of Philosophy Ph.D.||en_AU|
|dc.description.disclaimer||Access is restricted to staff and students of the University of Sydney . UniKey credentials are required. Non university access may be obtained by visiting the University of Sydney Library.||en_AU|
|Appears in Collections:||Sydney Digital Theses (University of Sydney Access only)|