Details
| Original language | English |
|---|---|
| Journal | Water resources research |
| Volume | 48 |
| Issue number | 4 |
| Publication status | Published - 19 Apr 2012 |
Abstract
We consider flow in a porous medium containing coarse-textured inclusions with a low value of air entry pressure, embedded in a fine-textured background material having high entry pressure. During imbibition some air remains trapped in the inclusions, while during drainage the inclusions become drained only after the capillary entry pressure exceeds the pressure of the background material. These effects can only be reproduced by a two-phase flow model, and not by the Richards' equation. However, if an upscaled form of the Richards' equation with appropriately modified capillary and permeability functions is used, the results are in a reasonable agreement with the two-phase flow model.
ASJC Scopus subject areas
- Environmental Science(all)
- Water Science and Technology
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In: Water resources research, Vol. 48, No. 4, 19.04.2012.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Upscaling unsaturated flow in binary porous media with air entry pressure effects
AU - Szymkiewicz, Adam
AU - Helmig, Rainer
AU - Neuweiler, Insa
PY - 2012/4/19
Y1 - 2012/4/19
N2 - We consider flow in a porous medium containing coarse-textured inclusions with a low value of air entry pressure, embedded in a fine-textured background material having high entry pressure. During imbibition some air remains trapped in the inclusions, while during drainage the inclusions become drained only after the capillary entry pressure exceeds the pressure of the background material. These effects can only be reproduced by a two-phase flow model, and not by the Richards' equation. However, if an upscaled form of the Richards' equation with appropriately modified capillary and permeability functions is used, the results are in a reasonable agreement with the two-phase flow model.
AB - We consider flow in a porous medium containing coarse-textured inclusions with a low value of air entry pressure, embedded in a fine-textured background material having high entry pressure. During imbibition some air remains trapped in the inclusions, while during drainage the inclusions become drained only after the capillary entry pressure exceeds the pressure of the background material. These effects can only be reproduced by a two-phase flow model, and not by the Richards' equation. However, if an upscaled form of the Richards' equation with appropriately modified capillary and permeability functions is used, the results are in a reasonable agreement with the two-phase flow model.
UR - http://www.scopus.com/inward/record.url?scp=84860238134&partnerID=8YFLogxK
U2 - 10.1029/2011WR010893
DO - 10.1029/2011WR010893
M3 - Article
AN - SCOPUS:84860238134
VL - 48
JO - Water resources research
JF - Water resources research
SN - 0043-1397
IS - 4
ER -