Ejecta, corolla and splashes from drop impacts on viscous fluids

We investigate both experimentally and numerically the impact of ethanol drops on deep pools of aqueous glycerol solutions with variable pool viscosity and air pressure. With this approach we are able to address
drop impacts on various substrates that continuously transition from low-viscosity liquids to almost solids. We show that the generic corolla spreading out from the impact point consists of two distinct sheets, namely an ejecta sheet fed by the drop liquid and a Peregrine sheet fed by the substrate liquid, which evolve on separated timescales. These two sheets contribute to a varying extent to the corolla overall dynamics and splashing, depending in particular on the viscosity ratio between the two liquids.