High pressure vaporization of LOX droplet crossing the critical conditions

Vaporization of liquid O2 droplet in quiescent high-temperature and high-pressure H2 gas is numerically investigated. Classical thermodynamic modeling of high pressure mixtures allows us to study the transition from subcritical to supercritical vaporization regime. It is observed that subcritical vaporization can be obtained up to pressures several times the oxygen critical pressure. Respective domain of both regimes is determined vs temperature and pressure. Border region corresponds to minimum value of droplet lifetime. This results from two cooperative phenomena: transient effect and thermodynamic property of mixtures. Sensitivity analysis additionally shows that state of art in dense fluid transport modeling yields results that should be considered accurate only as far as orders of magnitude are concerned. Copyright © 1996 Elsevier Science Ltd.