Image-Based Micro-Scale Modeling of Flow in Porous Media

Image-Based Micro-Scale Modeling of Flow in Porous Media

Bibliographic Details
Main Author: Riasi, Mohammad Sadegh
Language:English
Published: University of Cincinnati / OhioLINK 2019
Subjects:
Hydrology
Porous Media
Micro-scale
Fibrous Material
Coal Seam
Ultrafiltration Membrane
Pore Topology Method
Online Access:http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573571958611787
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spelling ndltd-OhioLink-oai-etd.ohiolink.edu-ucin15735719586117872021-12-16T05:34:01Z Image-Based Micro-Scale Modeling of Flow in Porous Media Riasi, Mohammad Sadegh Hydrology Porous Media Micro-scale Fibrous Material Coal Seam Ultrafiltration Membrane Pore Topology Method Porous materials are ubiquitous in nature and widely employed in many products and devices. Examples range from soil, living tissues, filters, and absorbent materials to fuel cells and microfluidic devices, driving the need to better understand the structure and processes in these materials. Their distinct properties, however, present new challenges in experimental and numerical characterization.Computer simulation of single-phase and multi-phase flow (e.g. air-water or oil-water systems) in porous media has been an indispensable tool in better understanding of the multi-phase flow phenomenon in complex porous structures as well as in porous systems design. In order to simulate fluid flow in a porous system, several constitutive relations are required that relate pore scale processes to physics of flow in continuum scale; such as capillary pressure-saturation curve, relative permeability-saturation curve and absolute permeability, to name a few. These relations used to be derived experimentally, but in the last few decades micro-scale (i.e. pore-scale) modeling approaches has gradually replaced the expensive experiments. Despite the success in micro-scale modeling and characterization of traditional low-porosity media (e.g. soil), implementing similar micro-modeling approaches on non-traditional porous structures has faced serious challenges. The objective of this dissertation is to address some of the challenges. Specifically homogeneous materials on the opposite ends of the porosity spectrum, as well as heterogeneous, hierarchical materials with gradient of pore size. In the category of homogeneous materials, I consider highly porous fibrous materials with porosity of above 80% (Chapter 2) and coals with porosity of under 5% (Chapter 3). In the heterogeneous category, I consider block copolymer ultrafiltration membranes with asymmetric hierarchical microstructure (Chapter 4). In Chapter 2, I introduce and develop Pore Topology Method (PTM), which is a micro-scale modeling approach designed to model flow using the 3D digital image of the porous structure. The proposed approach is a fast, algorithmically simple method that reduces the complexity of the 3-D void space geometry to its topologically consistent medial surface, and uses it as a solution domain for single- and multi-phase flow simulations. Throughout Chapters 2-3, PTM is used to simulate single- and two-phase flow in fibrous materials with 25%-95% porosity, as well as coal samples with porosity of under 5%. My study shows that PTM results for absolute/relative permeability and quasi-static drainage and imbibition simulations are in excellent agreement with other numerical methods, analytical solutions, and experimental data.In chapter 4, in the absence of a high-resolution 3D image for block copolymers ultrafiltration membranes, a Stochastic Pore Network Model (SPNM) is developed. The proposed 3D SPNM uses stochastic data collected from 2D SEM images and constructs a network model to compute permeability of the membrane. Comparing with experimental permeability values for two ultrafiltration membranes, excellent agreement was observed. 2019 English text University of Cincinnati / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573571958611787 http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573571958611787 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center.
collection NDLTD
language English
sources NDLTD
topic Hydrology
Porous Media
Micro-scale
Fibrous Material
Coal Seam
Ultrafiltration Membrane
Pore Topology Method
spellingShingle Hydrology
Porous Media
Micro-scale
Fibrous Material
Coal Seam
Ultrafiltration Membrane
Pore Topology Method
Riasi, Mohammad Sadegh
Image-Based Micro-Scale Modeling of Flow in Porous Media
author Riasi, Mohammad Sadegh
author_facet Riasi, Mohammad Sadegh
author_sort Riasi, Mohammad Sadegh
title Image-Based Micro-Scale Modeling of Flow in Porous Media
title_short Image-Based Micro-Scale Modeling of Flow in Porous Media
title_full Image-Based Micro-Scale Modeling of Flow in Porous Media
title_fullStr Image-Based Micro-Scale Modeling of Flow in Porous Media
title_full_unstemmed Image-Based Micro-Scale Modeling of Flow in Porous Media
title_sort image-based micro-scale modeling of flow in porous media
publisher University of Cincinnati / OhioLINK
publishDate 2019
url http://rave.ohiolink.edu/etdc/view?acc_num=ucin1573571958611787
work_keys_str_mv AT riasimohammadsadegh imagebasedmicroscalemodelingofflowinporousmedia
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