![]() Complicated dynamic interactions govern both tank pressurization and pressure control, including those between forced mixing, various gravity-dependent transport mechanisms in the vapor and liquid phases, and the condensation-evaporation process at the interface. ![]() This realization has provided a significant impetus for researchers to develop innovative pressure control designs-based on mixing the bulk tank fluid together with some form of active or passive cooling-to allow storage of cryogenic fluids with zero or reduced boiloff. Engineers can relieve this self-pressurization through venting, but repeated venting of the vapor during long-duration on-orbit or on-surface storage will result in significant propellant loss, rendering the cost of long distance human space expeditions prohibitive. It can be caused by the cryogen vaporization that results from heat leaks into a tank from its surroundings and support structure. ![]() One challenge facing engineers is self-pressurization. ![]() Home > Space > ISS Research Program > Microgravity Science Glovebox ZBOT BackgroundĪffordable and reliable cryogenic fluid storage for propellant or life support systems is integral to all phases of NASA’s projected space and planetary expeditions. ![]()
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