Vaporization of the non-spreading cryogenic-liquid pool on the concrete ground

摘要

The understanding of the vaporization of cryogenic liquids spilled on solid ground is essential for hazard assessments. Since the primary source of heat for vaporization comes from the ground, the conductive heat flux into the liquid pool from the ground surface should be thoroughly studied. Experiments conducted on the non-spreading pool usually omitted the initial period due to the discharge, and the boiling curve was not thoroughly analyzed. An attempt was made to fill these issues. In this work, the vaporization of the non-spreading cryogenic-liquid pool on the concrete ground was experimentally investigated. The discharge time was shortened as much as possible. The boiling of the liquid pool was analyzed based on both the boiling curve and the temperature histories measured near the ground surface. Besides, the influence of the pool depth on the vaporization was investigated. It was observed that the liquid pool experienced three typical boiling regimes, and the pool depth had a negligible influence on the vaporization. Furthermore, the experimental results were used to evaluate boiling correlations as well as the assumption of perfect thermal contact between the liquid and the ground surface. This study might help to enhance the understanding of heat transfer between the concrete ground and the cryogenic-liquid pool. In addition, the results obtained in this work can be used to validate vaporization models for cryogenic-liquid spills.