Objectives

Close knowledge gaps, develop and validate suitable models for phenomena relevant to release and mixing of LH2. Develop empirical and semi-empirical correlations when applicable. The phenomena include, but are not limited to

  • Flashing multiphase, multicomponent release phenomena
  • Mass and heat transfer including phase transition (evaporation, condensation and freezing of contaminants) in pools, plumes, jets and sprays
  • Free cryogenic jet principle structure, morphology and behaviour in realistic conditions including flammable envelope
  • Heat transfer effect on hydrogen concentration in impinging and/or wall attached jets
  • Effect of wind speed and direction on large-scale LH2 releases
  • Release and dispersion in confined and obstructed spaces, including pressure-peaking phenomena

Led by NCSRD

WP/ Exp. Nr.Phenomena/ NameTo be investigatedVariation ofPartner/ Test facility
E3.1aSmall Scale Multi-phase Releasepressure changes in bulk vessel BOS images, laser diagnostics of jet principle structure, potential wall attachment/ impingementInitial pressure Initial temperature Nozzle shape and cross-sectional area Extraction point (high/gaseous-low/liquid & middle)KIT/ HYKA-H8(He) DISCHA-facility in Test chamber V = 2.867 dm³
E3.1bSmall Scale Multi-phase Releasepressure changes in bulk vessel BOS images, laser diagnostics of jet principle structure, potential wall attachment/ impingementInitial pressure; Initial temperature; Nozzle shape and cross-sectional area; Extraction point (high/gaseous-low/liquid & middle)KIT/ CRYOVESSEL
E3.4Pool of LH2evaporation rate, cold gas mixing, O2 entrainment BOS imaging temperature profile in a gas concentr. profile in a gasMaterial of the ground; Initial temperature; Cross-windKIT Free Test Field
E3.5Rainout Testsevaporation rate, pool formationHSL/ Pool facility
Table contains all release and mixing experiments of PRESLHY project