MODEL OF MULTICOMPONENT LIQUID POOL EVAPORATION FORMED DUE ACCIDENTAL SPILLS
Keywords:evaporation, multicomponent mixture, model, phase equilibrium, heat flow, hydrocarbons, cryogenic substance, ethanol
Quantitative analysis and assessment of technogenic risk imply a thorough study of the emergency process at the level of phenomenology. In the process of such a study, mathematical models of the physical and chemical processes of the formation of a hazardous substance in the surrounding space, the occurrence and influence of damaging factors on recipients, which are people, the environment, buildings and equipment, are involved. One of the most common scenarios for the formation of a hazardous substance in the environment is the spillage of a liquid phase, often of a multicomponent composition, onto the earth's surface. The subsequent evaporation of a hazardous substance is a key factor in the formation of an explosive, flammable or toxic cloud. Therefore, it is extremely important to correctly assess the intensity of the release of a hazardous substance into the environment.
This study presents a mathematical model for the evaporation of a multicomponent liquid from the surface of an emergency spill, taking into account external energy flows that affect the evaporation process (heat flow from atmospheric air, heat flow from the underlying surface, radiation flow from the sun). The effect of cooling due to evaporation is taken into account. The developed model takes into account the mutual influence of the component composition of the liquid phase and the evaporation process. A comparative analysis of the simulation results was made with the published experimental data on the processes of evaporation of a cryogenic liquid (nitrogen) and liquids under non-boiling conditions such as ethanol and cyclohexane. The results of the comparison showed the applicability of the model in the field of quantitative risk analysis and assessment, and also revealed ways to improve the mathematical model of the multicomponent liquid pool evaporation.
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