Abstract
The author of this paper has been developing a high-efficient hydrogen energy system which uses slush hydrogen as a means of transporting and storing hydrogen energy, and a refrigerant for cooling superconducting power machines. In this system, a synergetic or hybrid effect is anticipated for slush hydrogen transported in a pipeline and stored as a fuel for fuel cells, with simultaneous transmission and storage of electrical power by means of superconducting power machines using MgB2 material. In this paper, thermo-fluid phenomena of cryogenic multiphase fluid in the development of this system are reported, which consist of hydrogen liquefaction by magnetic refrigeration, nucleate boiling heat transfer to slush hydrogen and liquid hydrogen, and pressure drop reduction and heat transfer deterioration phenomena of slush fluid due to the non-Newtonian fluid behavior.
