Analysis of an unsteady quasi-capillary channel flow with time-resolved PIV and RBF-based super-resolution

We investigate the interface dynamics in an unsteady quasi-capillary channel flow. The configuration consists of a liquid column that moves along vertical 2D channel, open to atmosphere and driven by controlled pressure head. Both advancing receding contact lines were analyzed test validity classic models for dynamic wetting study flow field near interface. operating conditions are characterized large acceleration, thus dominated inertia. shape moving meniscus was retrieved using Laser-Induced Fluorescence-based image processing, while via Time-Resolved Particle Image Velocimetry (TR-PIV). TR-PIV measurements enhanced post-processing, combination Proper Orthogonal Decomposition Radial Basis Functions achieve super-resolution velocity field. Large counter-rotating vortices observed, their evolution monitored terms maximum intensity Q-field. results show angle based on cannot describe at macroscopic scale. Moreover, impact is considerable extends several capillary lengths below