Type
Text
Type
Dissertation
Advisor
Lindquist, W. B. | Li, Xiaolin | Jiao, Xiangmin | Jones, Keith.
Date
2015-08-01
Keywords
Applied mathematics | Fluid flow, Image processing, Microstructure, Pore network, Throat
Department
Department of Applied Mathematics and Statistics.
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/77776
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
The concept of throats in porous media is critically re-examined as a geometric quantity with maintaining the standard notion of a throat as a locally minimum-area cross section in the void space. We demonstrate that throats can intersect each other. We show with flow simulation that these intersecting throats correspond to capillary pressure controlled entry points during drainage. We have developed a throat finding algorithm that explicitly allows and locates intersecting throats, using a planar approximation for robustness and speed. We show that the probability of intersecting throats increases significantly if the porosity is above 20%; in the sand pack, over 1/4 of all throats are intersecting throats. Using this pore network and other image analysis techniques, we analyze x-ray computed microtomography images of reactive flow experiments. Dissolution and re-precipitation are main reactions causing changes of pore structures and flow behavior. We especially observe intra dissolution as well as hollow grain produced by the combination of dissolution and precipitation. Comparing images of different time stamp voxel by voxel after fine registration makes it possible to trace the phase change such as early dissolution, late dissolution, or dissolution followed by re-precipitation. The dissolution and precipitation depth layer shows how deeply the reaction influences as well as how differently intra and surface dissolution occur. The reactions dramatically change pore structures; intra dissolution produces new pores; surface dissolution enlarges pore size or merges pores; precipitation reduces pore size, splits pores or removes pores. | 84 pages
Recommended Citation
Kim, Joo-won, "Throat intersection in pore networks and application to reactive flow" (2015). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 3554.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/3554