A Pusan National University research team has investigated storage and safety challenges relating to the use of liquefied hydrogen.
Specifically, they analysed heat flows and phase changes within a cryogenic fuel tank using multiphase-thermal flows.
Liquified hydrogen fuel can only be transported in cryogenic tanks (cryotanks), which maintain temperatures below -253⁰C — the boiling point of hydrogen. Despite thermal insulation, the liquefied fuel in a cryotank experiences a degree of vaporisation.
The flow rate of vaporisation is measured as “Boil-Off Gas (BOG).” Too high BOG can result in excess internal pressure inside the tank, leading to cracks and fissures. This makes understanding and controlling BOG a key factor in cryotank design.
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