Abstract
Velocity distribution of vertical pipes with large particle slurry plays an important role in pipeline transportation of minerals in hydraulic coal mining and ocean mining industry. The experiments of particle fluidization and particle vertical lift are conducted and the fluidization data of three kinds of large particles are analyzed. The results show that the vortex resistance prevents particles from moving as the coarse particles move in vertical pipes. An additional coefficient method is proposed to study the vortex resistance by increasing the coefficient of vortex resistance before interference. Mathematical model is established to describe the drag coefficient of the vortex by analyzing the influence factors of the experimental data and the drag coefficient of the vortex. In addition, calculation model of the velocity distribution of large particles in vertical pipe is proposed by analyzing the force, the fluid, and the solid momentum. Moreover, the experimental data of particle transport in vertical pipes are utilized to verify and analyze the proposed model.
Highlights
With the development of marine mining technology, some progresses in hydraulic transportation technology of coarse particle slurry in pipeline have been made in recent years
The calculation formula of the blockage velocity during vertical pipeline lifting has been studied by Jiang et al.1 and results indicate that the blockage velocity can be influenced by liquid, solid density, and the ratio of the maximum particle size to average particle size
Particle fluidization experiment and particle vertical lift experiment were conducted to investigate large particle slurry flow in vertical pipe, revealing forces acted on large particle and its influence on particle velocity distribution
Summary
With the development of marine mining technology, some progresses in hydraulic transportation technology of coarse particle slurry in pipeline have been made in recent years. The calculation formula of the blockage velocity during vertical pipeline lifting has been studied by Jiang et al. and results indicate that the blockage velocity can be influenced by liquid, solid density, and the ratio of the maximum particle size to average particle size. Particle fluidization experiment and particle vertical lift experiment were conducted to investigate large particle slurry flow in vertical pipe, revealing forces acted on large particle and its influence on particle velocity distribution. The results of the vertical pipeline transportation experiments are shown in Figure 3; it indicates that the water flow velocity Vm increases with increasing intergranular water speed vi, while local solid mean concentration Q decreases.
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