Experimental Investigation Of The Gas-Liquid Interface And Flow Field Dynamics Near The Contact Line In An Immersing Flat Surface
Damien Rigutto (1), Yannick Lecomte (2), Jean-Marie Buchlin (1), Benoit Scheid (3), Miguel Alfonso Mendez (1)
1: Environmental and Applied Fluid Dynamics, von Karman Institute for Fluid Dynamics, Waterloosesteenweg 72, Sint-Genesius-Rode,1640,Belgium
2: Transferts, Interfaces Et Procédés (TIPs), Université Libre de Bruxelles, Av. Franklin Roosevelt 50, Brussels, 1050, Belgium
3: Université Libre de Bruxelles, Av. Franklin Roosevelt 50, Brussels, 1050, Belgium
DOI:
Dynamic wetting is fundamental to many coating processes. In hot dip galvanization, an unstable contact line can generate wetting defects and air entrainment in the coating, limiting the quality of the final product. While the literature focuses mainly on capillary-viscous flows, which are amenable to analytical treatment, some configurations, such as dip coating, operate in inertia-dominated conditions. This work presents an extensive and unprecedented experimental characterization of the interface and contact line dynamics on a surface entering a liquid bath in inertia-dominated conditions using laser-induced fluorescence (LIF). Moreover, we complement the analysis with particle tracking velocimetry (PTV) underneath the gas-liquid interface to study the interaction between the liquid flow and the free surface. Proper orthogonal decomposition (POD) of the interface displacement is presented and analyzed in combination with the velocity field dynamics, enhanced by physics-constrained Radial Basis Functions (RBFs).
