Fig. 4
From: Tree frog attachment: mechanisms, challenges, and perspectives
Hydrodynamic (A) adhesion and (B) friction (1) during the schematic interaction between a toe pad (green) and the substrate based on displacement-induced flow of mucus (blue) and (2) in a model of the contact of two flat and rigid (cylindrical) plates. A area, dg gap width, F⊥,hyd hydrodynamic adhesion, F∥,hyd hydrodynamic friction, rp plate radius, u flow speed, v⊥ detachment speed, v∥ sliding speed, y spatial coordinate normal to the substrate, μ viscosity