Details zur Publikation

Kategorie Textpublikation
Referenztyp Zeitschriften
DOI 10.1029/2018WR024647
Lizenz creative commons licence
Titel (primär) Evaporation study based on micromodel experiments: Comparison of theory and experiment
Autor Geistlinger, H.; Ding, Y.; Apelt, B.; Schlüter, S.; Küchler, M.; Reuter, D.; Vorhauer, N.; Vogel, H.-J.
Quelle Water Resources Research
Erscheinungsjahr 2019
Department BOSYS
Band/Volume 55
Heft 8
Seite von 6653
Seite bis 6672
Sprache englisch
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 corners determine the time behavior of the evaporation rate. The internal water flux of the porous media is often described by capillary flow assuming complete wetting. Particularly, the crucial influence of partial wetting, that is, the nonlinear contact angle dependency of the capillary flow has been neglected so far. The focus of the paper is to demonstrate that SiO2‐surfaces can exhibit contact angles of about 40°. This reduces the internal capillary flow by 1 order of magnitude compared to complete wetting. First, we derived the contact angle by inverse modeling. We conducted a series of evaporation experiments in a 2‐D square lattice microstructure connected by lognormal distributed throats. We used an explicit analytical power series solution of the single square capillary model. A contact angle of 38° ± 1° was derived. Second, we directly measured the contact angle of the Si‐SiO2 wafer using the Drop Shape Analyzer Krüss 100 and obtained an averaged contact angle of 42° ± 2°. The results support the single square capillary model as an appropriate model for the description of the evaporation process in an ideal square capillary.
dauerhafte UFZ-Verlinkung
Geistlinger, H., Ding, Y., Apelt, B., Schlüter, S., Küchler, M., Reuter, D., Vorhauer, N., Vogel, H.-J. (2019):
Evaporation study based on micromodel experiments: Comparison of theory and experiment
Water Resour. Res. 55 (8), 6653 - 6672 10.1029/2018WR024647