Slush hydrogen, characterized by its commendable energy density and superior rheological properties at low temperatures, is considered a pivotal fuel for future rocket propulsion and a coolant in neutron sources. However, the complex mechanisms of solid-liquid two-phase flow and the limitations inherent in current preparation technologies curtail its broader application within the field. This review delineates the development trajectory of slush hydrogen research and sums up pivotal discussions on its thermophysical properties, methodologies for preparation and measurement, alongside flow and heat transfer dynamics. Comparative analyses of various preparation methodologies elucidate their underlying principles, merits, and demerits. Furthermore, the paper encapsulates the challenges of pipeline pressure drops and heat transfer mechanisms during transit, with a concentrated examination of issues such as sedimentation stratification and thermal leakage oscillations encountered in the transportation of slush hydrogen. Finally, prospective trends in slush hydrogen technology are addressed with an aim to augment its integration into aerospace applications.

slush hydrogen  /  thermophysical properties  /  preparation methods  /  measurement techniques  /  flow and heat transfer characteristics