Numerical Study of the Two-phase Flow Characteristics of Slush Nitrogen

2004 TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)  
The fundamental two-phase flow characteristics of slush nitrogen in a pipe are numerically investigated to develop effective cooling performance for long-distance superconducting cables. First, the governing equations of two-phase slush nitrogen flow based on the unsteady thermal non-equilibrium two-fluid model are constructed and several flow characteristics are numerically calculated taking into account the effects of slush volume fraction, thermodynamic behavior of slush, and duct shape.
more » ... hermore, the numerical results are compared with previous experimental results on pressure loss measurement and visualization measurement in two-phase slush nitrogen flow along the longitudinal direction of the pipe. According to this research, it is found that reducing the pressure loss using a two-phase slush flow is possible under the high Reynolds number condition and by applying the appropriate volume fraction of slush particles. The optimized thermal flow conditions for cryogenic two-phase slush nitrogen with practical use of latent heat for slush melting are predicted for the development of a new type of superconducting cooling system.
doi:10.2221/jcsj.39.463 fatcat:2gszwy3j4vdpvaehaybavs7obu