A simplified mathematical model for calculation of the consequences of chemical interaction of water vapour with beryllium coating in a closed cavity has been developed. Changes in the temperature of the beryllium coating and accumulation of water vapour and hydrogen in a spherical cavity (R ¼ 0.1 M) within 100 seconds have been studied. The calculations have been carried out for an inner coating of thickness 0.01 m and a material porosity from 0-2.7%.At various levels of heat transfer from the coating to the outer wall of the cavity, differences in the character and rate of hydrogen and water vapour accumulation in the cavity and differences in the coating temperature have been revealed. The relationship between the size of the through aperture in the cavity and the intensity of the processes within the cavity has been demonstrated.
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