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GAS-PARTICLE FLOWS IN CO2 PELLET-BLASTING NOZZLES

A numerical study was performed to investigate gas-particle flows in convergent divergent CO2 pellet-blasting nozzles. The solutions to the compressible Navier-Stokes equations and the equations governing the particles’ motion through the gas, in a Lagrangian frame of reference are solved iteratively in order to model the two-way mass momentum and energy exchanges between the two phases. Results are presented for the gas flow field and particle velocities at different particle loadings and inlet velocities. The momentum and energy exchange with the particles reduce the gas velocity in the divergent passage near the center. The presented results demonstrate the effects of particle loading and inlet velocity ratios on pellet and gas velocity and temperature through the nozzle.