Multiscale drainage dynamics with Haines jumps monitored by stroboscopic 4D X-ray microscopy.

Autor:	Tekseth KR; Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway., Mirzaei F; Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway., Lukic B; ESRF - The European Synchrotron, Grenoble 38043, France., Chattopadhyay B; Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway., Breiby DW; Department of Physics, Norwegian University of Science and Technology, 7491 Trondheim, Norway.; Department of Microsystems, University of South-Eastern Norway, 3184 Borre, Norway.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2024 Jan 02; Vol. 121 (1), pp. e2305890120. Date of Electronic Publication: 2023 Dec 26.
DOI:	10.1073/pnas.2305890120
Abstrakt:	Slow multiphase flow in porous media is intriguing because its underlying dynamics is almost deterministic, yet depends on a hierarchy of spatiotemporal processes. There has been great progress in the experimental study of such multiphase flows, but three-dimensional (3D) microscopy methods probing the pore-scale fluid dynamics with millisecond resolution have been lacking. Yet, it is precisely at these length and time scales that the crucial pore-filling events known as Haines jumps take place. Here, we report four-dimensional (4D) (3D + time) observations of multiphase flow in a consolidated porous medium as captured in situ by stroboscopic X-ray micro-tomography. With a total duration of 6.5 s and 2 kHz frame rate, our experiments provide unprecedented access to the multiscale liquid dynamics. Our tomography strategy relies on the fact that Haines jumps, although irregularly spaced in time, are almost deterministic, and therefore repeatable during imbibition-drainage cycling. We studied the time-dependent flow pattern in a porous medium consisting of sintered glass shards. Exploiting the repeatability, we could combine the radiographic projections recorded under different angles during successive cycles into a 3D movie, allowing us to reconstruct pore-scale events, such as Haines jumps, with a spatiotemporal resolution that is two orders of magnitude higher than was hitherto possible. This high resolution allows us to explore the detailed interfacial dynamics during drainage, including fluid-front displacements and velocities. Our experimental approach opens the way to the study of fast, yet deterministic mesoscopic processes also other than flow in porous media. Competing Interests: Competing interests statement:The authors declare no competing interest.
Databáze:	MEDLINE
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