Abstract

The transition velocity is defined here as the gas velocity at which minimum pressure drop occurs during pneumatic transport of coal char particles. As expected, these transition velocities decreased with larger bend radius and increased with solids flow rate. The velocities were also higher than those predicted from the Rizk correlation for transition velocities in horizontal tubes. Believing that centrifugal forces contribute to these higher transition velocities in helical coils, we modified the Rizk correlation to account for these centrifugal forces. Predictions from the modified correlation agree closely with experimental results.

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