Solid Formation in Flowing Cryogenic Fluids
The very low pressures encountered at high altitudes may result In problems in the utilization of cryogenic propellants due to the formation of solids at points of leakage and vents. Liquid oxygen and liquid hydrogen, when expanded below their triple-point pressures (1.1 mm and 56 mm, respectively) will form solid and metastable liquid with a reduction of temperature. The solid, if deposited in critical areas, may obstruct or retard flow and thereby cause a malfunction in the propellant system.
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