  In this fluid dynamics video, Ray-tracing data visualization technique was
used to obtain realistic and detailed flow motions during impinging of two
liquid jets. Different patterns of sheet and rim configurations were presented
to shed light into the underlying physics, including liquid chain, closed rim,
open rim, unstable rim and flapping sheet. In addition, stationary asymmetrical
waves were observed and compared with existing theories. The generation of
stationary capillary wave in respect to the liquid rim were explained by the
classic shallow water wave theory. The atomization process caused by
development of the impact waves were observed in detail, including
fragmentation of liquid sheet, formation of liquid ligaments, and breakup of
ligament into droplet. The locking-on feature of the wavelength of impact wave
were also found to be similar to that of perturbed free shear layers.
