DOI: 10.5194/hess-21-1063-2017
Scopus记录号: 2-s2.0-85013244033
论文题名: On the consistency of scale among experiments, theory, and simulation
作者: McClure J ; E ; , Dye A ; L ; , Miller C ; T ; , Gray W ; G
刊名: Hydrology and Earth System Sciences
ISSN: 10275606
出版年: 2017
卷: 21, 期: 2 起始页码: 1063
结束页码: 1076
语种: 英语
Scopus关键词: Capillarity
; Capillary flow
; Capillary tubes
; Mechanical permeability
; Porous materials
; Wetting
; Boundary pressure
; Experimental methods
; Fluid configuration
; Hydrologic process
; Interfacial areas
; Lattice Boltzmann simulations
; Porous medium systems
; Thermodynamically constrained averaging theories
; Equations of state
; capillary pressure
; data assimilation
; evaporation
; experimental design
; hydrological regime
; porous medium
; saturation
; simulation
; thermodynamics
; water content
; wetting
英文摘要: As a tool for addressing problems of scale, we consider an evolving approach known as the thermodynamically constrained averaging theory (TCAT), which has broad applicability to hydrology. We consider the case of modeling of two-fluid-phase flow in porous media, and we focus on issues of scale as they relate to various measures of pressure, capillary pressure, and state equations needed to produce solvable models. We apply TCAT to perform physics-based data assimilation to understand how the internal behavior influences the macroscale state of two-fluid porous medium systems. A microfluidic experimental method and a lattice Boltzmann simulation method are used to examine a key deficiency associated with standard approaches. In a hydrologic process such as evaporation, the water content will ultimately be reduced below the irreducible wetting-phase saturation determined from experiments. This is problematic since the derived closure relationships cannot predict the associated capillary pressures for these states. We demonstrate that the irreducible wetting-phase saturation is an artifact of the experimental design, caused by the fact that the boundary pressure difference does not approximate the true capillary pressure. Using averaging methods, we compute the true capillary pressure for fluid configurations at and below the irreducible wetting-phase saturation. Results of our analysis include a state function for the capillary pressure expressed as a function of fluid saturation and interfacial area. © Author(s) 2017. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/79250
Appears in Collections: 气候变化事实与影响
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作者单位: Advanced Research Computing, Virginia Tech, Blacksburg, VA, United States; Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, United States; Curriculum for the Environment and Ecology, University of North Carolina, Chapel Hill, NC, United States
Recommended Citation:
McClure J,E,, Dye A,et al. On the consistency of scale among experiments, theory, and simulation[J]. Hydrology and Earth System Sciences,2017-01-01,21(2)