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You searched for +publisher:"University of North Carolina" +contributor:("Dye, Amanda"). One record found.

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University of North Carolina

1. Dye, Amanda. Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling.

Degree: Environmental Sciences and Engineering, 2015, University of North Carolina

Modeling two-fluid-phase flow in porous medium systems requires the specification of closure relations to produce a solvable system. The thermodynamically constrained averaging theory (TCAT) has been used to formulate a closed model and to yield insights about the underlying microscale processes that must be represented at the macroscale. In this work we evaluate these TCAT developments using a two-dimensional microfluidic cell and an advanced lattice Boltzmann model (LBM). Microfluidic experiments were performed in which the external fluid pressures were varied and the system was allowed to equilibrate for a period of time before the next step change in fluid pressures. LBM simulations of drainage and imbibition were performed to mimic the experiments. Using imaging techniques the fluid distributions, interfacial areas, and interfacial curvatures of the experimental data were compared to the numerical results and analyzed. LBM simulations showed good agreement with the experimental data. The validated LBM was used to investigate the closure relations of the TCAT model. LBM simulations provided support for the existence of a unique relationship between capillary pressure, fluid saturation, and fluid-fluid interfacial area. The simulations also revealed that the approach to an equilibrium state involves a relatively slow process in which fluid interfaces relax to their equilibrium state. Motivated by this physical process, a temporally adaptive domain decomposition algorithm was developed using a level-set method to locate interfaces and estimate their rate of advancement. The proposed adaptive algorithm was shown to reduce computational effort by an order of magnitude, while yielding essentially identical solutions to a conventional fully coupled approach. Futhurmore, the microfluidic experiments were modified to study the dynamics of a two-fluid-phase flow. Viscous fingering and Haines jumps were visualized. The validated LBM was used to model the experimental data and showed good agreement for certain aspects of the dynamics. Overall, the results show that the developed experimental and computational techniques can be used to evaluate multiscale theoretical models of porous medium systems accurately. Advisors/Committee Members: Dye, Amanda, Miller, Cass T., Adalsteinsson, David, Gray, William, Huang, Jingfang, Prins, Jan, Vizuete, William.

Subjects/Keywords: Environmental engineering; Gillings School of Global Public Health; Department of Environmental Sciences and Engineering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Dye, A. (2015). Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling. (Thesis). University of North Carolina. Retrieved from https://cdr.lib.unc.edu/record/uuid:ea4cc594-b801-488f-9e32-65521eb57392

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Dye, Amanda. “Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling.” 2015. Thesis, University of North Carolina. Accessed December 01, 2020. https://cdr.lib.unc.edu/record/uuid:ea4cc594-b801-488f-9e32-65521eb57392.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Dye, Amanda. “Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling.” 2015. Web. 01 Dec 2020.

Vancouver:

Dye A. Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling. [Internet] [Thesis]. University of North Carolina; 2015. [cited 2020 Dec 01]. Available from: https://cdr.lib.unc.edu/record/uuid:ea4cc594-b801-488f-9e32-65521eb57392.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Dye A. Analysis of Two-Fluid-Phase Porous Medium Systems Using Microscale Experiments and Lattice Boltzmann Modeling. [Thesis]. University of North Carolina; 2015. Available from: https://cdr.lib.unc.edu/record/uuid:ea4cc594-b801-488f-9e32-65521eb57392

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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