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Experimental research and numerical simulation on cryogenic line chill-down process

机译：低温线路冷却过程的实验研究与数值模拟

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摘要

The empirical heat transfer correlations are suggested for the fast cool down process of the cryogenic transfer line from room temperature to cryogenic temperature. The correlations include the heat transfer coefficient (HTC) correlations for single-phase gas convection and film boiling regimes, minimum heat flux (MHF) temperature, critical heat flux (CHF) temperature and CHF. The correlations are obtained from the experimental measurements. The experiments are conducted on a 12.7?mm outer diameter (OD), 1.25?mm wall thickness and 7?m long stainless steel horizontal pipe with liquid nitrogen (LN2). The effect of the lengthwise position is verified by measuring the temperature profiles in near the inlet and the outlet of the transfer line. The newly suggested heat transfer correlations are applied to the one-dimensional homogeneous transient model to simulate the cryogenic line chill-down process, and the chill-down time and the cryogen consumption are well predicted in the mass flux range from 26.0?kg/m2?s to 73.6?kg/m2?s through the correlations.
机译：建议经验传热相关性用于从室温到低温温度的低温转移线的快速冷却过程。相关性包括用于单相气体对流和膜沸腾制度的传热系数（HTC）相关性，最小热通量（MHF）温度，临界热通量（CHF）温度和CHF。从实验测量中获得相关性。实验是在12.7mm的外径（OD），1.25Ω·壁厚和7？M长的不锈钢水平管上进行，具有液氮（LN2）。通过测量入口附近的温度曲线和转移线的出口来验证纵向位置的效果。将新建议的传热相关性施加到一维均匀瞬态模型，以模拟低温线路露天过程，并且在肿块磁通量范围内良好地预测了冷却时间和冷冻剂消耗量.KG / M2通过相关性来73.6？kg / m2。

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