Apparatus for producing fine snow particles from a flow of liquid carbon dioxide

Abstract From the Canadian patent

A system for producing a flow of fine snow particles includes a conduit for providing a pressurized flow of a cryogenic liquid and a nozzle coupled to the conduit, the nozzle having an outlet and an inlet pathway in communication with the conduit. An expansion member is positioned within the nozzle and covers the inlet pathway. The expansion member provides multiple fine channels for passage of the cryogenic fluid into a region of lower pressure, thereby enabling expansion of the cryogenic fluid during passage through the expansion member. In a preferred embodiment the cryogenic fluid is, carbon dioxide and the system parameters are set to enable the cryogenic fluid to enter a solid phase …