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O: Fachverband Oberflächenphysik

O 86: Focus Session: Wetting on Adaptive Substrates II (joint session CPP/DY/O)

O 86.1: Hauptvortrag

Donnerstag, 21. März 2024, 11:30–12:00, H 0107

A multi-scale approach to characterize wetting within a porous medium — •Maja Rücker¹, Ryan T. Armstrong², Chenhao Sun³, Peyman Mostaghimi², Steffen Berg^4,5, Paul Luckham⁵, Apostolos Georgiadis^4,5, and James E. McClure⁶ — ¹Eindhoven University of Technology, Eindhoven, NL — ²University of New South Wales, Sydney, Australia — ³China University of Petroleum, Beijing, China — ⁴Shell Global Solutions International B.V., Amsterdam, NL — ⁵Imperial College London, London, UK — ⁶Virginia Tech, Arlington, VA, USA

Considering a porous medium with two fluids in it, the fluid flow and distribution will depend on the wetting characteristic of the system. Recent developments in imaging techniques, such as micro-computed tomography and atomic force microscopy, alongside advances in computational modelling allowed for new concepts linking macroscopic wetting responses to the fundamental microscopic wetting definitions to emerge. We present an approach to upscale wetting parameters building upon energetic and geometric considerations and accounting for the various mechanisms related to wetting, manifesting at those different length scales. Starting from fluid-solid interactions, through the motion of three-phase contact lines to the evolution of fluid configurations in the porous medium, we show experimental observation on a coherent set of fluid/fluid/solid systems and discuss those in relation to the proposed upscaling concept. We will highlight the remaining questions for the characterization of wetting in the context of multiphase flow in porous media and point out future research directions.

Keywords: wetting; porous media; multiphase flow