We utilized superomniphobic surfaces to systematically investigate the different regimes of
coalescence-induced self-propulsion of liquid droplets with a wide range of droplet radii,
viscosities, and surface tensions. Our results indicate that the nondimensional jumping
velocity V j* is nearly constant (V j*≈ 0.2) in the inertial-capillary regime and decreases in
the visco-capillary regime as the Ohnesorge number Oh increases, in agreement with prior
work. Within the visco-capillary regime, decreasing the droplet radius R 0 results in a more …