The particle velocities and flow patterns in a flash dryer have been determined. The slip velocities, Reynolds numbers, and residence times of particles for different pneumatic duct segments were calculated at different applied gas velocities. The relationship between the rate of particle drying and the processing conditions (such as gas velocity and temperature, loading rate, etc.) for a pneumatic flash dryer is discussed. For a typically designed flash dryer, three zones representing a high heat flux between the gas and conveyed particles have been established: the feeding point, the elbows, and the cyclone. The correlation Nu = 0.00076Re'~64Pr0~52 was established.
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