Abstract
The source processes associated with the evaporation and initial spreading of cryogenic gases on water are investigated in a laboratory experiment. The direct contact of liquid nitrogen and water gives rise to phenomena which exert strong influence on the driving potential of the cold gas cloud; here investigated are superheating, and single and two-phase mass and energy transfer. Certain quantities have been measured directly in the source region or in the insulated spreading channel; others have been inferred from mass and energy balances. The water content in the cloud outside the source region, is found to consist only of ice particles; their size and number density have been determined by laser diffraction spectrometry.
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