Modeling 2D gravity-driven flow in unsaturated porous media for different infiltration rates

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F24%3A00601800" target="_blank" >RIV/68378271:_____/24:00601800 - isvavai.cz</a>
Alternative codes found
RIV/61989592:15310/24:73627735
Result on the web
<a href="https://hdl.handle.net/11104/0359258" target="_blank" >https://hdl.handle.net/11104/0359258</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.5194/hess-28-4947-2024" target="_blank" >10.5194/hess-28-4947-2024</a>

Result language
angličtina
Original language name
Modeling 2D gravity-driven flow in unsaturated porous media for different infiltration rates
Original language description
The gravity-driven flow in an unsaturated porous medium remains one of the most important unsolved problems in multiphase flow. Sometimes a diffusion-like flow with a uniform wetting front, known as stable flow, is observed, but, at other times, the flow is unstable with distinct preferential pathways. The formation of an unstable wetting front in a porous medium depends on many factors, including the type of porous medium, the initial saturation, and the applied infiltration rate. As the infiltration rate increases, the wetting front first transitions from stable to unstable at low infiltration rates and then from unstable to stable at high infiltration rates. We propose a governing equation and its discretized form, the semi-continuum model, to describe this significant non-monotonic transition. We show that the semi-continuum model is able to capture the influx dependence together with the correct finger width and spacing. Moreover, we demonstrate that the instability of the wetting front is closely related to the saturation overshoot in one dimension. Finally, we show that the flow can still be preferential even when the porous medium is completely wetted.
Czech name
—
Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10305 - Fluids and plasma physics (including surface physics)

Project
<a href="/en/project/EF17_049%2F0008422" target="_blank" >EF17_049/0008422: Research and Development Network in the Field of Lightening and Imaging Technologies and Optoelectronics for Optics and Automotive Industry</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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