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Title: Geometric state function for two-fluid flow in porous media

Journal Article · · Physical Review Fluids
 [1];  [2]; ORCiD logo [3];  [4];  [5];  [6];  [6]
  1. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  2. Univ. of New South Wales, Sydney, NSW (Australia)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  4. Helmholtz-Centre for Environmental Research–UFZ, Halle (Germany)
  5. Shell Global Solutions International B.V., Amsterdam (The Netherlands)
  6. Univ. of North Carolina at Chapel Hill, Chapel Hill, NC (United States)

Models that describe two-fluid flow in porous media suffer from a widely recognized problem that the constitutive relationships used to predict capillary pressure as a function of the fluid saturation are nonunique, thus requiring a hysteretic description. As an alternative to the traditional perspective, we consider a geometric description of the capillary pressure, which relates the average mean curvature, the fluid saturation, the interfacial area between fluids, and the Euler characteristic. The state equation is formulated using notions from algebraic topology and cast in terms of measures of the macroscale state. Synchrotron-based x-ray microcomputed tomography and high-resolution pore-scale simulation is applied to examine the uniqueness of the proposed relationship for six different porous media. We show that the geometric state function is able to characterize the microscopic fluid configurations that result from a wide range of simulated flow conditions in an averaged sense. The geometric state function can serve as a closure relationship within macroscale models to effectively remove hysteretic behavior attributed to the arrangement of fluids within a porous medium. As a result, this provides a critical missing component needed to enable a new generation of higher fidelity models to describe two-fluid flow in porous media.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1515702
Alternate ID(s):
OSTI ID: 1467953
Journal Information:
Physical Review Fluids, Vol. 3, Issue 8; ISSN 2469-990X
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 77 works
Citation information provided by
Web of Science

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Cited By (7)

Porous Media Characterization Using Minkowski Functionals: Theories, Applications and Future Directions journal November 2018
Theory and Applications of Macroscale Models in Porous Media journal April 2019
Description of Free Energy for Immiscible Two‐Fluid Flow in Porous Media by Integral Geometry and Thermodynamics journal November 2018
Nonhysteretic Capillary Pressure in Two‐Fluid Porous Medium Systems: Definition, Evaluation, Validation, and Dynamics journal August 2019
Micro- and macro-scale water retention properties of granular soils: contribution of the X-Ray CT-based voxel percolation method journal January 2019
Non-isothermal Transport of Multi-phase Fluids in Porous Media. Constitutive Equations journal January 2019
Toward a New Generation of Two-Fluid Flow Models Based on the Thermodynamically-Constrained Averaging Theory journal October 2019