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Quantification of Evaporation and Drainage Processes in Unsaturated Porous Media Using Magnetic Resonance Imaging

Ranzinger, Florian; Hille‐Reichel, Andrea; Zehe, Erwin; Guthausen, Gisela; Horn, Harald

Abstract:
The water loss in packed beds was studied spatially and time‐resolved via magnetic resonance imaging on the pore scale. The packed beds were measured under water‐saturated and unsaturated conditions, while the magnetic resonance method allowed a quantitative differentiation between air, liquid, and solid phases exploring the native contrast of the named phases without additional contrast agents. Beside a qualitative image comparison, subsequent quantitative image processing allowed for a detailed spatially resolved determination of water distribution, the differentiation between water transport processes, and the quantification of liquid clusters in 3‐D. Results are presented for two packed beds that show significant differences in their evaporation and drainage dynamics, which are mainly determined by the physical properties of the packed beds. The water loss of the packed bed of 2–4mmquartz particles reached a level below interpretability after 18.2 hr; meanwhile, a successive decrease of the largest liquid cluster volume from 82.5 to 0.7 mm$^{3}$ was observed. The water content of the packed bed of 2 mm glass spheres was still observable after 70.9 hr. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000120528
Veröffentlicht am 24.06.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Institut für Wasser und Gewässerentwicklung (IWG)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 07.02.2020
Sprache Englisch
Identifikator ISSN: 0043-1397, 1944-7973
KITopen-ID: 1000120528
Erschienen in Water resources research
Band 56
Heft 2
Seiten e2019WR026658
Nachgewiesen in Scopus
Web of Science
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