A qualitative model of flashing across an aperture with a pressure differential

Abstract

Many industries use materials that are stored above their atmospheric pressure boiling points (superheated liquids) which can form two-phase mixtures upon their accidental release to the environment at ambient conditions. The behaviour and the characteristics of these liquid-gas mixtures during a superheated liquid release due to the breaking of the metastable state can significantly affect the hazard zone and the mitigation steps that can be taken to minimize the release impact for the hydrocarbon industry or the quality of the combustion, or explosions inside the diesel engines. The dependence of the whole process over the initial parameter values as the pressure, the temperature and others factors, which can created, for some cases, a complete breaking of the liquid core into droplets at the same time that it is going out of container like unstable jet, or a complete one phase liquid jet, is recreated by an empirical model based on the flashing process similarity and a damped second order system. Results of this model agreed with some available experimental data. © 2010 WIT Press.