液氮抽真空制冷的理论及试验

陈振华; 张伟; 高荣; 陈万华; 赖欢; 宋远佳

doi:10.13224/j.cnki.jasp.2019.09.014

液氮抽真空制冷的理论及试验

doi: 10.13224/j.cnki.jasp.2019.09.014

中国空气动力研究与发展中心设备设计及测试技术研究所,四川绵阳 621000

基金项目: 国家自然科学青年基金（51806234）

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出版历程
- 收稿日期: 2019-03-22
- 刊出日期: 2019-09-28

Theoretical and experimental studies of vacuum cooling of liquid nitrogen

摘要

摘要: 在考虑液氮总质量变化、储罐罐体热容的前提下,基于化学势温差,传热系数和传质系数等参数,详细建立了液氮降压制备过冷液氮的数学模型。理论计算的液氮温度及质量变化和制取过冷液氮试验值吻合较好,结果表明:该数学模型能准确描述液氮相变过程,且获得了液氮抽真空制冷中相变传热的化学势温差为1.21 K、传热系数为2 942.37 W/(m2·K)及传质系数为0.004 4 m/s。
- 抽真空制冷 /
- 过冷液氮 /
- 化学势温差 /
- 传热系数 /
- 传质系数
Abstract: Considering the total mass change of liquid nitrogen and heat capacity of tank, the mathematical model of vacuum cooling of liquid nitrogen based on the physico-chemical depression, heat transfer coefficient and mass transfer coefficient approach was built. The theoretical results were in satisfactory agreement with the experimental data of making subcooled liquid nitrogen, which indicated the mathematical model could well predict the phase change of liquid nitrogen. The physico-chemical depression of 1.21 K, heat transfer coefficient of 2 942.37 W/(m2·K) and mass transfer coefficient of 0.004 4 m/s respectively were also obtained.
- vacuum cooling /
- subcooled liquid nitrogen /
- physico-chemical depression /
- heat transfer coefficient /
- mass transfer coefficient

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参考文献(18)

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