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The role of contact angle on unstable flow formation during infiltration and drainage in wettable porous media
Year:
2013
Source of publication :
Water Resources Research
Authors :
Graber, Ellen
;
.
Volume :
49
Co-Authors:
Wallach, R., R.H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Hertzel St., Rehovot 76100, Israel
Margolis, M., R.H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Hertzel St., Rehovot 76100, Israel
Graber, E.R., Institute of Soil, Water, and Environmental Sciences Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
Facilitators :
From page:
6508
To page:
6521
(
Total pages:
14
)
Abstract:
The impact of contact angle on 2-D spatial and temporal water-content distribution during infiltration and drainage was experimentally studied. The 0.3-0.5 mm fraction of a quartz dune sand was treated and turned subcritically repellent (contact angle of 33°, 48°, 56°, and 75° for S33, S48, S56, and S75, respectively). The media were packed uniformly in transparent flow chambers and water was supplied to the surface as a point source at different rates (1-20 ml/min). A sequence of gray-value images was taken by CCD camera during infiltration and subsequent drainage; gray values were converted to volumetric water content by water volume balance. Narrow and long plumes with water accumulation behind the downward moving wetting front (tip) and negative water gradient above it (tail) developed in the S56 and S75 media during infiltration at lower water application rates. The plumes became bulbous with spatially uniform water-content distribution as water application rates increased. All plumes in these media propagated downward at a constant rate during infiltration and did not change their shape during drainage. In contrast, regular plume shapes were observed in the S33 and S48 media at all flow rates, and drainage profiles were nonmonotonic with a transition plane at the depth that water reached during infiltration. Given that the studied media have similar pore-size distributions, the conclusion is that imbibition hindered by the nonzero contact angle induced pressure buildup at the wetting front (dynamic water-entry value) that controlled the plume shape and internal water-content distribution during infiltration and drainage. Key Points Non-zero contact angle induces saturation overshoot in wettable media Contact angle induces sharp change in water content along the plumes perimeter Contact angle and water flux determine the plume dimension and size ©2013. American Geophysical Union. All Rights Reserved.
Note:
Related Files :
Contrast media
Quartz
saturation
saturation overshoot
Volumetric water content
Water accumulation
Water source
Wettability
Show More
Related Content
More details
DOI :
10.1002/wrcr.20522
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
26522
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:23
Scientific Publication
The role of contact angle on unstable flow formation during infiltration and drainage in wettable porous media
49
Wallach, R., R.H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Hertzel St., Rehovot 76100, Israel
Margolis, M., R.H. Smith Faculty of Agriculture, Food and Environment, Hebrew University of Jerusalem, Hertzel St., Rehovot 76100, Israel
Graber, E.R., Institute of Soil, Water, and Environmental Sciences Volcani Center, Agricultural Research Organization, Bet Dagan, Israel
The role of contact angle on unstable flow formation during infiltration and drainage in wettable porous media
The impact of contact angle on 2-D spatial and temporal water-content distribution during infiltration and drainage was experimentally studied. The 0.3-0.5 mm fraction of a quartz dune sand was treated and turned subcritically repellent (contact angle of 33°, 48°, 56°, and 75° for S33, S48, S56, and S75, respectively). The media were packed uniformly in transparent flow chambers and water was supplied to the surface as a point source at different rates (1-20 ml/min). A sequence of gray-value images was taken by CCD camera during infiltration and subsequent drainage; gray values were converted to volumetric water content by water volume balance. Narrow and long plumes with water accumulation behind the downward moving wetting front (tip) and negative water gradient above it (tail) developed in the S56 and S75 media during infiltration at lower water application rates. The plumes became bulbous with spatially uniform water-content distribution as water application rates increased. All plumes in these media propagated downward at a constant rate during infiltration and did not change their shape during drainage. In contrast, regular plume shapes were observed in the S33 and S48 media at all flow rates, and drainage profiles were nonmonotonic with a transition plane at the depth that water reached during infiltration. Given that the studied media have similar pore-size distributions, the conclusion is that imbibition hindered by the nonzero contact angle induced pressure buildup at the wetting front (dynamic water-entry value) that controlled the plume shape and internal water-content distribution during infiltration and drainage. Key Points Non-zero contact angle induces saturation overshoot in wettable media Contact angle induces sharp change in water content along the plumes perimeter Contact angle and water flux determine the plume dimension and size ©2013. American Geophysical Union. All Rights Reserved.
Scientific Publication
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