Premium
A simple extension of two‐phase characteristic curves to include the dry region
Author(s) -
Webb Stephen W.
Publication year - 2000
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/2000wr900057
Subject(s) - capillary pressure , extension (predicate logic) , saturation (graph theory) , simple (philosophy) , vapor pressure , capillary action , thermodynamics , flow (mathematics) , adsorption , mathematics , materials science , porosity , mechanics , porous medium , chemistry , computer science , physics , geometry , combinatorics , epistemology , composite material , programming language , philosophy
Two‐phase characteristic curves are necessary for the simulation of water and vapor flow in porous media. Existing functions such as van Genuchten [1980], Brooks and Corey [1966], and Luckner et al . [1989] have significant limitations in the dry region as the liquid saturation goes to zero. This region, which is important in a number of applications, including liquid and vapor flow and vapor‐solid sorption, has been the subject of a number of previous investigations. Most previous studies extended standard capillary pressure curves into the adsorption region to zero water content and required a refitting of the revised curves to the data. In contrast, the present method provides for a simple extension of existing capillary pressure curves without the need to refit the experimental data. Therefore previous curve fits can be used, and the transition between the existing fit and the relationship in the adsorption region is easily calculated. The data‐model comparison shows good agreement. This extension is a simple and convenient way to extend existing curves to the dry region.