An experimental study on the impact of Boger and Newtonian droplets on spherical surfaces

This study examined the impact of Boger droplets on spherical surfaces, considering various properties liquids and surfaces for first time. The experimental setup involved spheres with three different diameters composed hydrophilic hydrophobic surfaces. main innovative aspect present lies in examination effects rheological including elasticity, elongational viscosity, normal stress difference solid via analysis. For this purpose, results are compared to equivalent Newtonian same viscosity surface tension coefficient. research also explored influences Weber number, diameter ratio, wettability dynamic behaviors viscoelastic during spreading receding stages. suggested that increasing number increases maximum factor droplets. A smaller ratio required more time reach factor. significantly affected phase, while its effect stage was minimal. Droplets exhibited retraction higher contact angles. fluids showed greater than highlighting influence fluid elasticity. It is shown caused by extensional droplet resulting from shear deformation, showing between these two types concerning