Two-fluid coaxial atomization in a high-pressure environment

We study the dynamics of atomization a liquid column by coaxial gas flow with varying pressures. Specifically, we analyse how density increase associated elevated pressures in ambient and co-flowing jet influences destabilization breakup process, as well resulting droplet formation dispersion. present new experimental results for liquid–gas atomizer operating high-pressure environment, gas–liquid momentum ratio range $M = 5\unicode{x2013}56$ pressurized densities $\rho _g/\rho _0 1\unicode{x2013}5$ , where _0$ is at standard conditions. High-speed shadowgraphy images are used to quantify spatially temporally interface spray near-field. Liquid core lengths, spreading angles other metrics presented, influence identified from comparison atmospheric In mid-field, phase Doppler interferometry conjunction laser velocimetry size velocities, their radial variations across spray. Results show an pressures, when keeping constant. Finally, that these observations line predictions Kelvin–Helmholtz Rayleigh–Taylor instabilities, both which relevant process.