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Development and experimental evaluation of models for low capillary number two-phase flows in rough walled fractures relevant to natural gradient conditions Metadata

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Title

  • Main Title Development and experimental evaluation of models for low capillary number two-phase flows in rough walled fractures relevant to natural gradient conditions

Creator

  • Author: Glass, R. J.
    Creator Type: Personal
  • Author: Yarrington, L.
    Creator Type: Personal
    Creator Info: Sandia National Labs., Albuquerque, NM (United States)
  • Author: Nicholl, M. J.
    Creator Type: Personal
    Creator Info: Oklahoma State Univ., Stillwater, OK (United States)

Contributor

  • Sponsor: United States. Department of Energy. Office of Civilian Radioactive Waste Management.
    Contributor Type: Organization
    Contributor Info: USDOE Office of Civilian Radioactive Waste Management, Washington, DC (United States)

Publisher

  • Name: Sandia National Laboratories
    Place of Publication: Albuquerque, New Mexico
    Additional Info: Sandia National Labs., Albuquerque, NM (United States)

Date

  • Creation: 1997-09-01

Language

  • English

Description

  • Content Description: The major results from SNL`s Conceptual Model Development and Validation Task (WBS 1.2.5.4.6) as developed through exploration of small scale processes were synthesized in Glass et al. to give guidance to Performance Assessment on improving conceptual models for isothermal flow in unsaturated, fractured rock. There, pressure saturation and relative permeability curves for single fractures were proposed to be a function of both fracture orientation within the gravity field and initial conditions. We refer the reader to Glass et al. for a discussion of the implications of this behavior for Performance Assessment. The scientific research we report here substantiates this proposed behavior. We address the modeling of phase structure within fractures under natural gradient conditions relevant to unsaturated flow through fractures. This phase structure underlies the calculation of effective properties for individual fractures and hence fracture networks as required for Performance Assessment. Standard Percolation (SP) and Invasion Percolation (IP) approaches have been recently proposed to model the underlying phase saturation structures within the individual fractures during conditions of two-phase flow. Subsequent analysis of these structures yields effective two-phase pressure-saturation and relative permeability relations for the fracture. However, both of these approaches yield structures that are at odds with physical reality as we see in experiments and thus effective properties calculated from these structures are in error. Here we develop and evaluate a Modified Invasion Percolation (MIP) approach to better model quasi-static immiscible displacement in fractures. The effects of gravity, contact angle, local aperature field geometry, and local in-plane interfacial curvature between phases are included in the calculation of invasion pressure for individual sites in a discretized aperture field.
  • Physical Description: 123 p.

Subject

  • Keyword: Geologic Models
  • Keyword: Hydrology
  • Keyword: Fluid Flow
  • STI Subject Categories: 05 Nuclear Fuels
  • Keyword: Underground Facilities
  • Keyword: Geologic Fractures
  • Keyword: Site Characterization
  • Keyword: Spent Fuels
  • Keyword: Yucca Mountain
  • Keyword: High-Level Radioactive Wastes
  • Keyword: Underground Disposal

Source

  • Other Information: PBD: Sep 1997

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Report

Format

  • Text

Identifier

  • Other: DE98000057
  • Report No.: SAND--96-2820
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/534488
  • Office of Scientific & Technical Information Report Number: 534488
  • Archival Resource Key: ark:/67531/metadc690682

Note

  • Display Note: INIS; OSTI as DE98000057
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