Whichever process is used, cleaning depends on either the liquid carbon dioxide solvent properties, the energy and momentum transfer by the impacting solid phase, or a combination of solvent properties and momentum or energy transfer. Pellet systems rely upon the thermo-mechanical impact stresses related to the high impact velocity of macroscopic pellets for contamination removal - a momentum and energy transfer process. Snow sprays rely upon a combination of solvent action of liquid CO2 and the momentum transfer of high velocity microscopic snow particles. The liquid based CO2 washing systems rely upon the liquid phase solvent properties. Finally, the SFC systems rely exclusively upon carbon dioxide's unique supercritical fluid properties.
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