Abstract
A mathematical study has identified the operating and design conditions that may lead to pressure collapse in a supercritical, cryogenic oxygen storage system. Pressure collapse is attributed to unexpected mixing of warmer and colder stored oxygen, and physical property behavior which leads to consequent loss of pressure is identified. The extent and seriousness of pressure losses are indicated by the results of numerical case studies based on a mathematical model of a 5-ft capacity, supercritical, cryogenic oxygen storage system. The capabilities of a simple on-off heater system to control pressure were determined as functions of operating pressure range and limit, withdrawal rate, heating rate, and heater and oxygen-withdrawal locations. An electric heater (or heaters) uniformly distributed over the inside surface of the tank would be much better than a heater in the center of the tank. A maximum operating pressure between 70 and 100 atm is desirable.
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