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Experiment Study on Lifting Velocity and Concentration of Coarse Particles for Vertical Hydraulic Lifting

Author: JiangLong
Tutor: HanWenLiang
School: Tsinghua University
Course: Hydraulic Engineering
Keywords: Coarse particles Vertical tube Of hydraulic lift Lifting speed Transport concentration
CLC: TV142
Type: Master's thesis
Year: 2005
Downloads: 219
Quote: 8
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Abstract


Hydraulic lift in the vertical tube of coarse particles in the deep-sea mining, hydraulic mining, closed mining problem frequently encountered in the lake and river dredging. Limited to the level of pipe for pipeline transportation of solid-liquid two-phase flow, the study of the past pseudo-homogeneous flow conveying aspects coarse vertical tube study less. Pseudo-homogeneous flow is different from the horizontal pipe due to significant slip velocity between the coarse particles and the fluid, the nature of the coarse solid-liquid two-phase flow in a vertical tube. The vertical tube of hydraulic lift system is designed to enhance the speed of the first answer. To this end, the experimental study of the first settlement of coarse particles in still water experiments. Settling velocity formula coarse particles through the experimental data, and compared with the Stokes formula. The results show that the shape factor of the settling velocity of coarse particles. Second, the experimental study of coarse particles floating speed. Taking into account the the pipeline velocity distribution inhomogeneity demonstrated coarse planktonic speed is generally less than the settling velocity of the reasons. Then, on the basis of the preceding two experiments, analysis of coarse particles to enhance the critical state of the campaign, and considering the particle density, the particle size, particle shape, particle concentration, particle size distribution, and other factors critical to enhance the speed of the deduced critical to enhance the speed of the semi-empirical formula. Finally, through the the vertical tubes critical clogging experimental formula rate given, compared with the experimental results of others and through initial validation formula rationality. In In vertical tube hydraulic lifting of the process, the particles are not only subject to the vertical direction of the force, but also by the radial force of the upward movement of the solid particles at the same time, there is the trend of the movement of the center of the pipe. In this paper, the effects of a vertical tube hydraulic characteristics enhance radial distribution of coarse particle concentration and the use of the diffusion equation is derived coarse particle concentration distribution formula. In addition, this study also analyzed the relationship between particle the group slip velocity and lifting speed, corrected the slip velocity of the particles is equal to the settling velocity of the particles, conveying the concentration must be smaller than the awareness of the local concentration that conveying concentration, the local concentration lifting speed. The critical lifting speed formula derived in this study to consider more fully the impact factor of the particles enhance the speed, has a clear physical meaning, in good agreement with the available experimental data, and thus a good reference value for engineering practice. But limited to the limitations of the experimental conditions, the critical lifting speed formula and the particle concentration distribution formula to be further verified.

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CLC: > Industrial Technology > Hydraulic Engineering > The basic science of water resources project > Sediment dynamics, River Dynamics > Sediment movement
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