Details zur Publikation |
| Kategorie | Textpublikation |
| Referenztyp | Zeitschriften |
| DOI | 10.1029/2021WR029861 |
Lizenz  |
|
| Titel (primär) | Impact of surface roughness on evaporation in 2D micromodels |
| Autor | Ding, Y.; Geistlinger, H. |
| Quelle | Water Resources Research |
| Erscheinungsjahr | 2021 |
| Department | BOSYS |
| Band/Volume | 57 |
| Heft | 11 |
| Seite von | e2021WR029861 |
| Sprache | englisch |
| Topic | T5 Future Landscapes |
| Supplements | https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2021WR029861&file=2021WR029861-sup-0001-Supporting+Information+SI-S01.docx https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2021WR029861&file=2021WR029861-sup-0002-Movie+SI-S01.mp4 https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2021WR029861&file=2021WR029861-sup-0003-Movie+SI-S02.mp4 https://agupubs.onlinelibrary.wiley.com/action/downloadSupplement?doi=10.1029%2F2021WR029861&file=2021WR029861-sup-0004-Movie+SI-S03.mp4 |
| Keywords | Capillary flow visualization; 2D micromodel evaporation; Surface roughness; Wettability; Fractal evaporation front |
| Abstract | Evaporation - a key process for water exchange between soil and
atmosphere - is controlled by internal water fluxes and surface vapor
fluxes. Recent studies demonstrated that the dynamics of the water flow
in pore corners and thick-film flow on the rough pore-solid interface
determine the time behavior of the evaporation rate. A comprehensive
experimental study of the combined effect of corner flow (CF) and
thick-film flow (TFF) on evaporation is lacking. Herein, we present a
comparative micromodel study of the evaporation process using 2D-porous
media, which exhibit the same stochastic pore structure, but different
degree of surface roughness (silicon micromodels with smooth surface;
glass-ceramic micromodels with rough surface). Our study proves both
experimentally and theoretically that surface roughness and wettability play a key role for the time- and temperature behavior of the evaporation process. We found a similar  -behavior up to 42°C regarding the mass loss as function of time in stage-2 and a transition to linear t-behavior
for higher temperatures (61°C), with high statistical significance
(regression coefficients near 1) for both micromodels. Our experimental
results elucidate the strong temporal correlation between mass loss and
geometric pattern of the unsaturated CF and TFF region. Partial wetting in silicon micromodels causes a weak driving force for CF, whereas complete wetting
in glass-ceramic micromodels causes a strong driving force for TFF. For
a consistent description of the time-dependent mass loss and geometry
of the CF/TFF region, the fractality of the evaporation front
must be considered. Based on our data we estimate the film-thickness and
discover some interesting film thinning effect with increasing
temperature. |
| dauerhafte UFZ-Verlinkung | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=25254 |
| Ding, Y., Geistlinger, H. (2021): Impact of surface roughness on evaporation in 2D micromodels Water Resour. Res. 57 (11), e2021WR029861 10.1029/2021WR029861 |
|