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Title: Nonhysteretic Capillary Pressure in Two‐Fluid Porous Medium Systems: Definition, Evaluation, Validation, and Dynamics

Journal Article · · Water Resources Research
DOI:https://doi.org/10.1029/2018WR024586· OSTI ID:1557900
ORCiD logo [1];  [1];  [2];  [3];  [4]
  1. Department of Environmental Sciences and Engineering University of North Carolina Chapel Hill NC USA
  2. Department of Mathematics University of North Carolina Chapel Hill NC USA
  3. Advanced Research Computing Virginia Tech Blacksburg VA USA
  4. Department of Environmental Sciences and Engineering University of North Carolina Chapel Hill NC USA, Department of Civil and Environmental Engineering University of Vermont Burlington VT USA

Abstract A closure relation for capillary pressure plays an important role in the formulation of both traditional and evolving models of two‐fluid‐phase flow in porous medium systems. We review the traditional approaches to define capillary pressure, to describe it mathematically, to determine parameters for this relation, and to constrain the domain of applicability of this relation. In contrast to the traditional approach, we provide a rigorous, multiscale definition of capillary pressure, define the state domain of interest in practice, summarize computational and experimental approaches to investigate the system state, and apply the methods for two‐fluid states in a model ink bottle system, the classical Finney pack of spheres, and a synthetic sphere pack system. The results of these applications show that a state equation exists that describes capillary pressure without hysteresis. This state equation parameterizes a function that describes the nonwetting phase volume fraction in terms of the capillary pressure, the interfacial area, and the specific Euler characteristic of the nonwetting phase. Furthermore, this state equation applies over the complete range of conditions encountered in practice, and it applies under both equilibrium and dynamic conditions. This state equation involving capillary pressure forms an important foundation for the development of the next generation of macroscale two‐fluid‐phase flow models in porous medium systems.

Sponsoring Organization:
USDOE
Grant/Contract Number:
INCITE
OSTI ID:
1557900
Journal Information:
Water Resources Research, Journal Name: Water Resources Research Vol. 55 Journal Issue: 8; ISSN 0043-1397
Publisher:
American Geophysical Union (AGU)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 20 works
Citation information provided by
Web of Science

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