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SYDW: Symposium Dynamical wetting of flexible, adaptive and switchable surfaces

SYDW 1: Dynamical wetting of flexible, adaptive and switchable surfaces (SYDW)

SYDW 1.2: Hauptvortrag

Donnerstag, 19. März 2020, 15:30–16:00, HSZ 02

Modelling imbibition, dynamic wetting and evaporation on structured surfaces and porous coatings — •Tatiana Gambaryan-Roisman and Noemi Ghillani — TU Darmstadt, FG Technische Thermodynamik, Alarich-Weiss-Str. 10

Wetting of structured surfaces and surfaces with porous coatings, for example, nanofiber mats, is relevant for a wide variety of technical applications, such as printing technologies, superhydrophobic material applications and heat transfer enhancement technologies. Imbibition and evaporation of liquids on such surfaces are responsible for significant improvement of cooling efficiency during drop impact cooling and flow boiling. Up to now, no reliable model exists which is able to predict the kinetics of imbibition coupled with forced wetting/dewetting and evaporation on surfaces with porous coatings and surfaces with topography. In this work we consider one of mechanisms of imbibition on structured/porous substrates. This is the capillary pressure-driven flow in a groove or in a corner formed between a flat substrate and a fiber attached to it (representative of the first layer of a fiber mat). In this work theoretical/numerical model of simultaneous imbibition and evaporation is developed, in which viscosity, surface tension, gravity and forced wetting/dewetting are taken into account. The results are compared with available experimental data.