| 摘要 |
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 (10) COUPLE TO THE CONDUIT, THE NOZZLE (10) HAVING AN OUTLET AND AN INLET PARTWAY IN COMMUNICATION WITH THE CONDUIT. AN EXPANSION MEMBER (34) IS POSITIONED WITHIN THE NOZZLE (10) AND COVERS THE INLET PATHWAY. THE EXPANSION MEMBER(34) 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 (34). 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 AT OR NEAR THE OUTLET SURFACE OF THE EXPANSION MEMBER AND TO EXIT THEREFROM AS A FINE SNOW PARTICULATE. (FIG.6)
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