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פותח על ידי קלירמאש פתרונות בע"מ -
Dynamic contact angle explanation of flow rate-dependent saturation-pressure relationships during transient liquid flow in unsaturated porous media
Year:
1999
Authors :
פרידמן, שמואל
;
.
Volume :
13
Co-Authors:
Friedman, S.P., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Facilitators :
From page:
1495
To page:
1518
(
Total pages:
24
)
Abstract:
The common assumption when modeling transient liquid flow in an unsaturated porous medium is that the capillary pressure-saturation degree relationship is independent of the macroscopic liquid flux. This assumption is not always applicable, and one reason for this is the dependence of the solid-liquid-gas contact angle at the moving liquid-gaseous interface on the flow velocities, as found in systems such as long cylindrical capillaries. In the present theoretical study, a conjecture is made that at a prescribed capillary pressure the criterion for the liquid phase to invade an empty pore is defined by the Young-Laplace equation, but with the expected dynamic contact angle used instead of the static one. An iterative procedure, based on a simplified description of the pore system, enables a quantitative estimation of the extent of the liquid flux dependence of the capillary pressure-saturation degree relationship. For a given capillary pressure, the degree of liquid saturation decreases with increasing liquid flow velocity, for wetting processes, and vice versa for drainage. This effect of the liquid flux is more pronounced as the width of the pore-size distribution increases. © 1999 VSP.
Note:
Related Files :
Dynamic contact angle
Liquid flux
porous media
Rolling resistance
Young Laplace equation
עוד תגיות
תוכן קשור
More details
DOI :
10.1163/156856199X00613
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
19475
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:29
Scientific Publication
Dynamic contact angle explanation of flow rate-dependent saturation-pressure relationships during transient liquid flow in unsaturated porous media
13
Friedman, S.P., Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Volcani Center, Bet Dagan 50250, Israel
Dynamic contact angle explanation of flow rate-dependent saturation-pressure relationships during transient liquid flow in unsaturated porous media
The common assumption when modeling transient liquid flow in an unsaturated porous medium is that the capillary pressure-saturation degree relationship is independent of the macroscopic liquid flux. This assumption is not always applicable, and one reason for this is the dependence of the solid-liquid-gas contact angle at the moving liquid-gaseous interface on the flow velocities, as found in systems such as long cylindrical capillaries. In the present theoretical study, a conjecture is made that at a prescribed capillary pressure the criterion for the liquid phase to invade an empty pore is defined by the Young-Laplace equation, but with the expected dynamic contact angle used instead of the static one. An iterative procedure, based on a simplified description of the pore system, enables a quantitative estimation of the extent of the liquid flux dependence of the capillary pressure-saturation degree relationship. For a given capillary pressure, the degree of liquid saturation decreases with increasing liquid flow velocity, for wetting processes, and vice versa for drainage. This effect of the liquid flux is more pronounced as the width of the pore-size distribution increases. © 1999 VSP.
Scientific Publication
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