Nucleation of Hydrogen Droplets in Supercooling Condition in Droplet Formation Chamber
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Graphical Abstract
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Abstract
Because of the existence of supercooling in a droplet formation chamber, the hydrogen microspheres are still in liquid phase even though their temperature is lower than the triplepoint temperature. This may cause the droplets to shatter in the vacuum injection capillary. Based on the knowledge about supercooling of liquid hydrogen, we have done a thermodynamic simulation of the droplets in the droplet formation chamber, and theoretically suggested the optimal working conditions under which the droplets will most properly nucleate to solid pellets. The suggested working conditions are that the heliumgas pressure and the hydrogen vapor pressure in the droplet formation chamber are kept as low as possible, and the droplet formation chamber should be noless than 6 cm in the length.
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