In this combined experimental study, hydrodynamics of single stream of HFE-7100 droplets striking a pre-wetted solid surface was investigated. Experimentally, single stream of mono-dispersed droplets were produced using a piezoelectric droplet generator with the ability to adjust parameters such as droplet impingement frequency, droplet diameter and droplet velocity. A high speed camera system was used to capture the liquid crown propagation process given the high frequency of droplet impingement. Low-Weber number droplet impingements resulted in smooth spreading of the liquid crown while splashing (i.e. the emergence of secondary droplets from the rim of the crown) was observed at high Weber number cases. The dynamics of the crown propagation was analyzed and a correlation that takes into account non-dimensional crown diameter and non-dimensional time has been postulated.
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