Heat Exchange between an Evaporating Heated Liquid and Underlying Solid Layer

When substantiating the measures and technical means of emergency protection for fire and explosion hazard in the petrochemical and oil-refining industries, it is necessary to determine the explosion hazard indicators of technological units. These indicators are determined by the amount of vapor released into the environment during accidental spills. For the technological facilities of the petrochemical and oil-refining industries, the handling of large volumes of flammable liquids in a heated state in technological processes is typical. In the case of emergency releases of non-boiling heated liquids, the main source of vapor entering into the environment is the process of evaporation from the free surfaces of pools. The complexity of calculating the mass of evaporated substance from emergency spills of heated liquids is related to the non-stationarity of the vapor supply due to liquid cooling. The dominant factor that determines the dynamics of the temperature change of the heated liquid in the pool is the heat removal in the zone of contact between the liquid phase and the underlying solid layer. The choice of the model of heat exchange between the pool and the underlying layer can significantly affect the reliability of estimates of the evaporated mass from spills of heated liquids. In this work, a comparative analysis of the results of calculating the mass of evaporated liquid, obtained using analytical and numerical models for calculating the heat flow in the contact zone of the liquid phase and the solid underlying layer, is carried out.