Abstract
This article investigates gas–solid two-phase flow in a vertical screw conveyor and analyzes the distribution function of the circumferential velocity of particles in the radial direction. Theoretical analysis combined with EDEM+FLUENT simulation analysis is performed to determine the best fill rate, the best screw speed, and critical Reynolds number when Taylor–Couette–Poiseuille flow stable helical vortex forms in the vertical screw conveyor. The formula for the critical Reynolds number and the best throughput is determined under different friction coefficients to establish an efficient design method based on Taylor–Couette–Poiseuille stable helical vortex flow. The method greatly benefits the design of vertical screw conveyors.
Highlights
The vertical screw conveyor is a type of conveyor without flexible traction components
The best screw speed of the TCPSHV flow formed in the vertical screw conveyor is 500 r/min; this finding is the same as the results for the analysis of the helix angle
This article analyzed the speed of the particle in the vertical screw conveyor and the distribution function of circumferential speed of the particle in the radial direction
Summary
The vertical screw conveyor is a type of conveyor without flexible traction components. According to the preceding simulation calculation, the best screw speed of the TCP-SHV flow formed in the vertical screw conveyor is 0 and the best filling rate is 70%, and when R2 = 0:15 m, S = 0:225 m, and r = 0:7 t=m3, the friction coefficient between the particle and the screw blade is m1 = 0:2 and that between the particle and the pipe wall is m2 = 0:2 Substituting these parameters in formula (14), the critical Reynolds number of the TCP-SHV flow formed in the vertical screw conveyor can be obtained as follows vT = R2 À R1 vT dr.
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