Abstract 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.

中文翻译：

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混凝土地面不扩散低温液池的汽化

摘要 了解溢出在固体地面上的低温液体的汽化对于危险评估至关重要。由于汽化的主要热源来自地面，因此应彻底研究从地表进入液池的传导热通量。在非扩散池上进行的实验通常由于排放而省略了初始阶段，并且没有彻底分析沸腾曲线。已尝试解决这些问题。在这项工作中，实验研究了混凝土地面上非扩散低温液体池的汽化。尽可能缩短放电时间。基于沸腾曲线和在地表附近测量的温度历史来分析液体池的沸腾。除了，研究了池深对汽化的影响。据观察，液体池经历了三种典型的沸腾状态，池深度对汽化的影响可以忽略不计。此外，实验结果用于评估沸腾相关性以及液体和地面之间完美热接触的假设。这项研究可能有助于增强对混凝土地面和低温液体池之间传热的理解。此外，在这项工作中获得的结果可用于验证低温液体泄漏的汽化模型。实验结果用于评估沸腾相关性以及液体和地面之间完美热接触的假设。这项研究可能有助于增强对混凝土地面和低温液体池之间传热的理解。此外，在这项工作中获得的结果可用于验证低温液体泄漏的汽化模型。实验结果用于评估沸腾相关性以及液体和地面之间完美热接触的假设。这项研究可能有助于增强对混凝土地面和低温液体池之间传热的理解。此外，在这项工作中获得的结果可用于验证低温液体泄漏的汽化模型。