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Teng, Yuntian,

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Non-Darcian Flow, Multiphase Flow, and Hydration Thermodynamics in Subsurface Energy and Environmental Systems /

Record Type:	Electronic resources : Monograph/item
Title/Author:	Non-Darcian Flow, Multiphase Flow, and Hydration Thermodynamics in Subsurface Energy and Environmental Systems // Yuntian Teng.
Author:	Teng, Yuntian,
Description:	1 electronic resource (143 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
Contained By:	Dissertations Abstracts International86-03B.
Subject:	Ocean engineering. -
Online resource:	https://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=31301200
ISBN:	9798384044628

Non-Darcian Flow, Multiphase Flow, and Hydration Thermodynamics in Subsurface Energy and Environmental Systems /
Teng, Yuntian,

Non-Darcian Flow, Multiphase Flow, and Hydration Thermodynamics in Subsurface Energy and Environmental Systems /Yuntian Teng. - 1 electronic resource (143 pages)

Source: Dissertations Abstracts International, Volume: 86-03, Section: B.

Nuclear energy contributes to 18% of national electricity generation. However, spent fuel is currently stored on the surface, necessitating constant monitoring, which incurs significant costs. After decades of research, long-term geological storage of high-level nuclear waste has become a consensus, requiring permanent sealing with engineered clay barriers. Clay is a buffer and backfill material in geological repositories for high-level nuclear waste due to its high swelling pressure, naturally low permeability and porosity, and strong solid-liquid interactions between water and smectite mineral surfaces. Furthermore, high-level nuclear wastes continue releasing heat for centuries, leading to complex water flow conditions and cycles of local hydration and dehydration in the engineered clay barrier.In this dissertation, we first conducted a comprehensive review of non-Darcian flows in low-permeability porous media by compiling existing experimental data and comparing current models. Second, we developed novel core-flooding equipment to reveal the relationship between the threshold pressure gradient and permeability under various temperatures in a clay-sand mixture, validating the two-parameter continuum-scale model to predict both non-Darcian and Darcy flow regimes. Next, we utilized cyclic hydration gravimetry and calorimetry methods to uncover the mechanism of hydration hysteresis in swelling smectites, which is driven by phase transitions controlled by heat stored in weakly screened interfacial charges. Finally, we combined micro-CT imaging with the lattice Boltzmann method to investigate the microscopic characterization and two-phase fluid flow in porous geomaterials targeting the geological storage of carbon dioxide in basalt formation.This dissertation enhances the understanding of non-Darcian flows, reveals hydration hysteresis, and provides a methodology for exploring two-phase flows in geological porous media.

English

ISBN: 9798384044628Subjects--Topical Terms:

660731
Ocean engineering.
Subjects--Index Terms:

Nuclear energy

Non-Darcian Flow, Multiphase Flow, and Hydration Thermodynamics in Subsurface Energy and Environmental Systems /
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520 $a Nuclear energy contributes to 18% of national electricity generation. However, spent fuel is currently stored on the surface, necessitating constant monitoring, which incurs significant costs. After decades of research, long-term geological storage of high-level nuclear waste has become a consensus, requiring permanent sealing with engineered clay barriers. Clay is a buffer and backfill material in geological repositories for high-level nuclear waste due to its high swelling pressure, naturally low permeability and porosity, and strong solid-liquid interactions between water and smectite mineral surfaces. Furthermore, high-level nuclear wastes continue releasing heat for centuries, leading to complex water flow conditions and cycles of local hydration and dehydration in the engineered clay barrier.In this dissertation, we first conducted a comprehensive review of non-Darcian flows in low-permeability porous media by compiling existing experimental data and comparing current models. Second, we developed novel core-flooding equipment to reveal the relationship between the threshold pressure gradient and permeability under various temperatures in a clay-sand mixture, validating the two-parameter continuum-scale model to predict both non-Darcian and Darcy flow regimes. Next, we utilized cyclic hydration gravimetry and calorimetry methods to uncover the mechanism of hydration hysteresis in swelling smectites, which is driven by phase transitions controlled by heat stored in weakly screened interfacial charges. Finally, we combined micro-CT imaging with the lattice Boltzmann method to investigate the microscopic characterization and two-phase fluid flow in porous geomaterials targeting the geological storage of carbon dioxide in basalt formation.This dissertation enhances the understanding of non-Darcian flows, reveals hydration hysteresis, and provides a methodology for exploring two-phase flows in geological porous media.
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653 $a Two-phase fluid flow
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