Study of the fragmentation of the liquid core in high-speed planar jets

The current study focuses on the complete fragmentation of the liquid core when a liquid jet is injected into a quiescent gas medium. By considering the spatial linear stability analysis for a planar jet, a large-scale sinuous mode is observed at large wavelengths when the gas shear layer thickness is high. When these modes were imposed in a VoF simulation to analyze their manifestation in the non-linear regime, they were found to be dominant even in the non-linear regime leading to the liquid core fragmentation. Further analysis of the energy budget, the pressure fluctuations in the gas are found to be the main factor that causes these large-scale modes to grow leading to the liquid core fragmentation.