Numerical study of liquid imbibition and contact line pinning in a sealing gap for corrosion protection of metal housings
by Daniel Hagg; Alexander Eifert; Torsten Troßmann; Bettina Frohnapfel; Holger Marschall; Martin Wörner
Progress in Computational Fluid Dynamics, An International Journal (PCFD), Vol. 24, No. 2, 2024

Abstract: Sealing gaps are common in housings that protect sensitive assemblies from potential damage by the environment. A prevalent measure to prevent water from reaching the sealing ring are pinning grooves. In this work, the influence of material wettability on the capillary-driven penetration of water into a generalised sealing gap geometry with pinning groove is investigated numerically for the first time. Interface-resolving two-phase flow simulations are performed with a diffuse-interface phase-field method solving the coupled Cahn-Hilliard Navier-Stokes equations. In the simulations of a gap geometry with pinning groove, the imbibition process is slowed down but not stopped for contact angles up to about 50°, while imbibition is prevented for contact angles larger than about 55°. The different behaviour is explained by the edge effect in wetting which interacts with liquid inertia. Volume-of-fluid simulations performed for comparison show similar behaviour with slight differences in imbibition speed and much higher spurious currents.

Online publication date: Fri, 01-Mar-2024

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