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Unconfined Hydrogen Spillage: Formation of Large Clouds

This study explores processes following a liquid hydrogen spill, focusing on cloud formation and explosion risks. Limited data and knowledge prompt experiments with LH2, yielding feasible but risky outcomes. The research delves into modeling routes, turbulence sources, and vaporization processes, offering reinterpretations of past tests.

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Unconfined Hydrogen Spillage: Formation of Large Clouds

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  1. Processes of the formation of large unconfined clouds following a massive spillage of liquid hydrogen on the ground Christophe PROUST – Jean-Marc LACOME DAGBA – Didier JAMOIS – Lionel PERRETTE

  2. N2(g) + 3 H2(g) <==> 2 NH3(g) + 92 kJ increase = transportation => LH2 => large spills ...

  3. Still today very limited data … • Zabetakis et al. (1961) • Makeev et al. (1981) • Witcofski et al. (1984) • Schmidtchen et al. (1994) • Verfondern K. (1997) • … and consequently limited knowledge : • liquid pool formation and evaporation? • H2-air cloud formation processes ? • explosion regime ?

  4. EXPERIMENTS

  5. buoyancy driven adiabatic • 1st STEP with LHe : • spilling device • instrumentation to clarify mixing processes • predict likely H2 explosion violence • 2nd STEP with LH2...

  6. 1 kg/s LH2 <=> 2 kg/s LHe

  7. SOME RESULTS

  8. 10% 50 to 100 %

  9. CONCLUSIONS

  10. Real LH2 experiments : feasible but dangerous • Routes for modelling • intrinsic source of turbulence : buoyancy • iso-lines on 6 tests • vaporisation processes ? • Some reinterpretation of previous tests...

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