共查询到17条相似文献,搜索用时 130 毫秒
1.
2.
针对低温容器夹层真空失效工况,建立了低温容器夹层真空度与通过内罐壁面热流密度的理论模型,结合ANSYS-FLUENT软件对某立式低温容器内的液氮蒸发过程进行了仿真模拟,研究了初始充满率为50%时,低温容器内罐空间温度及压力随夹层真空度变化的规律。结果表明,随着夹层真空度降低,通过低温容器内罐壁面的平均热流密度增大,内罐中液体温度升高速率增大;当夹层真空完全失效时,内罐压升率分别是夹层真空度为10-3 Pa、1 Pa和10 Pa时的10.4倍、5倍和1.2倍。 相似文献
3.
4.
低温流体状态方程研究 总被引:6,自引:2,他引:4
本研究了可用于低温流体热力学性质计算的状态方程,提出一个改进型的Patel-Teja状态方程,给出了24种常用低温流体的方程常数、其中包括氢、氦等量子气体。用新方程对24种常用低温流体的饱和蒸汽压,饱和蒸汽比容,饱和液体比容等进行了计算并与传统方程进行了比较。 相似文献
5.
6.
7.
8.
9.
10.
随着近代科学技术的发展,气体液化技术也有很大发展.低温液化气体的应用领域日益广泛,逐渐地从军用普及到民用、从宇宙空间等尖端技术部门发展到一般工业技术部门,并发展到与医学、生物学密切相关的国民经济各领域.这样,如果不很好地解决低温液体的贮存和输送问题,将使低温技术和工业气体的应用受到限制. 随着我国工农业生产的新发展,国民经济各部门需要各种类型的液化气体容器,供贮存和运输之用,其中要求制造各种型式的液氮容器.遵照上级指示,国营一一一厂、北京市牛奶公司和中国科学院物理研究所共同参加了研制液氮生物制品贮存容器(以下… 相似文献
11.
12.
13.
Stratification is one of the main causes for vaporization of cryogens and increase of tank pressure during cryogenic storage. This leads subsequent problems such as cavitation in cryo-pumps, reduced length of storage time. Hence, it is vital to prevent stratification to improve the cost efficiency of storage systems. If stratified layers exist inside the tank, they have to be removed by suitable methods without venting the vapor. Sonication is one such method capable of keeping fluid layers mixed. In the present work, a mechanistic model for ultrasonic destratification is proposed and validated with destratification experiments done in water. Then, the same model is used to predict the destratification characteristics of cryogenic liquids such as liquid nitrogen (LN2), liquid hydrogen (LH2) and liquid ammonia (LNH3). The destratification parameters are analysed for different frequencies of ultrasound and storage pressures by considering continuous and pulsed modes of ultrasonic operation. From the results, it is determined that use of high frequency ultrasound (low-power/continuous; high-power/pulsing) or low frequency ultrasound (continuous operation with moderate power) can both be effective in removing stratification. 相似文献
14.
15.
16.