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The process of phase transition to the solid state of carbon dioxide vapors contained in an expanding gas mixture stream consists of the formation of crystallization centers and subsequent growth of the crystals formed, due to an increase in the degree of supercooling of the stream. Crystals nucleate in certain sections of the flow part of the expanders and grow as they move in the flow. Therefore, crystals of carbon dioxide of various sizes can be found in each of certain sections. As a result of their interaction, coagulation, expressed as the adhesion of smaller crystals to larger ones, can occur. The influence of the coagulation process on the change in the number of smaller crystals and on the growth of larger ones is considered. Equations are given on the basis of which the calculations of the studied processes are made.

The effect of coagulation on the processes of growth and changes in the numerical concentration of carbon dioxide crystals