SKM 2023 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe

DY: Fachverband Dynamik und Statistische Physik

DY 36: Wetting, Fluidics and Liquids at Interfaces and Surfaces I (joint session CPP/DY)

DY 36.1: Vortrag

Donnerstag, 30. März 2023, 09:30–09:45, MER 02

Dynamic wetting of concentrated granular suspensions — •Reza Azizmalayeri, Peyman Rostami, and Günter K. Auernhammer — Leibniz-Institut für Polymerforschung Dresden e.V., Dresden, Germany

Concentrated granular suspensions are employed in a variety of processes where the contact line dynamics and internal structure of the suspension interact. The process can be characterized using individual particle analysis and average suspension descriptions. Along the contact line, particles interact with each other and the substrate, and the shear rate influence the suspension's non-Newtonian rheological behavior. In this study, we use fluorescently-labeled tracer particles in a refractive index-matched silica suspension. We track the motion of the tracer particles in the concentrated suspension with astigmatism particle tracking velocimetry (APTV). Averaging over single tracks gives the flow profile in a droplet near the advancing contact line. In addition, side-view allows characterizing the drop shape. The behavior of high-concentration suspensions near contact lines differs significantly from that of simple liquids. Near the advancing contact line, we observe the fast-moving layering of suspensions close to the substrate, which is controlled by the suspension's rheology. Near the receding contact line, the suspension adheres to its previous layer and moves on top of it. Initially, there is an unsteady motion, which becomes stationary with time.