  Post impingement morphology and dynamics of water droplets on convex
cylindrical surfaces has been explored experimentally. Droplet impact and
post-impact feature studies have been conducted on hydrophillic and
superhydrophobic cylindrical surfaces. Effects of the impact Weber number and
target-to-drop diameter ratio have been studied. The post-impact hydrodynamics
have been quantified using the wetting fraction, the spreading factor and
nondimensional film thickness at the north pole of the target. The observations
reveal that the wetting fraction and spread factor increases with an increase
in the impact We and decrease in the target to drop diameter ratio. An opposite
trend is noted for nondimensional film thickness at the targets north pole. It
is also deduced that the spread factor is independent of the target
wettability. The lamella dynamics post spreading has also been observed to be a
strong function of the wettability, impact We and the diameter ratio. An
analytical expression for temporal evolution of film thickness at north pole of
the cylinderical target is derieved. Another theoretical model based on energy
conservation for predicting the maximum wetting fraction for variant
cylindrical targets in terms of the governing We and Capillary number and the
experimental measurements are in good agreement with the theoretical
predictions.
