RESEARCH PAPER
Old and new wetting liquids separation in grain-based pattern micromodel during wetting cycles
1
Department of Bioenvironmental Systems Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106319, Taiwan (R.O.C.)
2
Graduate Institute of Hydrological and Oceanic Sciences, National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County 320, Taiwan (R.O.C)
3
Department of Mechanical Engineering, National Central University, No.300, Jhongda Rd., Jhongli City, Taoyuan County 320, Taiwan (R.O.C)
4
Institute of Agrophysics, Polish Academy of Sciences, Doświadczalna 4, 20-290 Lublin, Poland
Final revision date: 2024-09-29
Acceptance date: 2024-10-16
Publication date: 2024-11-08
Corresponding author
Int. Agrophys. 2024, 38(4): 447-456
HIGHLIGHTS
- Grain-based micromodel reveals interplay between new and old wetting liquids
- Grain-based micromodel demonstracts the role of wetting films
- Liquid film on grains crucial for old liquid entrapment
- Films provide connection between new and old liquids
- Weak film development enhances the separation of new and old liquids
KEYWORDS
wetting phase entrapmentgrain-based pattern micromodelnewold water interactionecohydrological separation
TOPICS
ABSTRACT
In soils, old (residual) water can persist despite new (invading) water infiltration, potentially due to trapped air bubbles isolating old water pockets. However, the mechanisms behind air bubble formation and liquid separation remain unclear. This study aims to investigate the interaction between new and old wetting liquids and the mechanism that traps air bubbles, isolating old water. Using a grain-based pattern micromodel, we examined these processes during a repeated wetting cycle (wetting-drainage-evaporation-wetting). To enhance visualization and evaporation, we used dyed alcohol solutions as the wetting phase, with air as the non-wetting phase. Results indicate that a liquid film on grains plays a crucial role in old liquid entrapment, influenced more by soil wettability than initial liquid content. Strong wettability resulted in significant film development, allowing old and new liquids to connect and potentially mix. In contrast, weak wettability led to air bubble entrapment, isolating old water and preventing its displacement. The findings highlight that soil wettability and wetting film development are key factors in the interaction between new and old wetting liquids.
FUNDING
This work was funded by National Science and Technology Council under grant: NSTC 113-2116-M-002-001- (2024-2025).
CONFLICT OF INTEREST
The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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| eISSN: | 2300-8725 |
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