Basic Study on Two‐Phase Flow Characteristics of Slush Nitrogen in a Pipe
Basic Study on Two‐Phase Flow Characteristics of Slush Nitrogen in a Pipe
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氮泥管道内两相流特性的基础研究
DOI：
10.1063/1.1774794
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发表时间：
2004
期刊：
影响因子：
--
通讯作者：
A. Ito
中科院分区：
文献类型：
--
作者：
J. Ishimoto;R. Ohno;H. Yanagi;A. Machida;M. Ikeuchi;K. Hattori;A. Ito
通过数值和实验研究了管道中氮浆的基本两相流特性，以开发长距离超导电缆的有效冷却性能。首先，提出了基于非稳态热非平衡双流体模型的两相泥浆氮流的控制方程，并考虑了泥浆体积分数、颗粒直径和管道形状的影响，对几种流动特性进行了数值计算。此外，在实验研究中，通过雪泥雾化喷嘴产生微小的雪泥，并测量了两相雪泥氮流沿管道纵向的非稳态压力和温度分布。根据数值和实验结果发现，在长距离管道长度的情况下，使用泥浆可以降低压力损失。此外，还预测了低温两相熔融氮的优化热流条件以及熔融潜热的实际应用，以开发新型超导冷却系统。
The fundamental two‐phase flow characteristics of slush nitrogen in a pipe are numerically and experimentally investigated to develop effective cooling performance for long distance superconducting cables. First, the governing equations of the two‐phase slush nitrogen flow based on the unsteady thermal nonequilibrium two‐fluid model are presented and several flow characteristics are numerically calculated taking into account the effects of slush volume fraction, particle diameter, and duct shape. Furthermore, in experimental study, minute slush is generated by the slush atomization nozzle and the unsteady pressure and temperature distributions of two‐phase slush nitrogen flow along the longitudinal direction of pipe are measured. According to the numerical and experimental results, it is found that the reduction of the pressure loss by using slush is possible in the case of long distance pipe lengths. Also, optimized thermal flow conditions for cryogenic two‐phase slush nitrogen with practical use of latent heat of slush melting are predicted for the development of new type superconducting cooling systems.