Analysis on influencing factors of coarse particles migration in pipeline transportation of paste slurry

被引：0
|
作者：
Yan B.-H. [1 ,2 ]
Li C.-P. [1 ,2 ]
Wu A.-X. [1 ,2 ]
Wang S.-Y. [1 ,2 ]
Hou H.-Z. [1 ,2 ]
机构：
[1] School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing
[2] State Key Laboratory of High-Efficient Mining and Safety of Metal Mines, Ministry of Education, Beijing
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2018年 / 28卷 / 10期
基金：
中国国家自然科学基金;
关键词：
Dimensionless numbers; Influencing factors; Macroscopic particle model; Paste backfill slurry; Rheological parameter;
D O I：
10.19476/j.ysxb.1004.0609.2018.10.23
中图分类号：
学科分类号：
摘要：
The paste backfill slurry with coarse aggregate had the problems of coarse particles settlement and wall wear serious in pipeline transportation. It was difficult to analyze the influencing factors of coarse particles' radial migration in the pipeline sections by conventional pipe flow experiments. In this work, based on the law of movement of particles in viscoplastic fluid and the actual situation of paste backfill technology, the influence of rheological parameters of paste slurry on coarse particles' law of migration was studied by numerical simulation. For actual production, the ratio λ of pipe diameter to coarse aggregate particles diameter was relatively small, coarse aggregate particles could be regarded as macroscopic particles in particle-fluid coupling analysis, and the Macroscopic Particle Model (MPM) was used for numerical simulation. Taking the dimensionless numbers of Bingham fluid, i.e., plastic viscosity Reynolds number Re p and Bingham number B i as quantitative evaluation indexes, the influence of yield stress and plastic viscosity of backfill slurry on coarse aggregate particles' law of migration was analyzed. The results show that the radial migration of coarse aggregate particles in the shear flow region is inversely proportional to the yield stress value and Bingham number B i , is directly proportional to the plastic viscosity value, and is directly proportional to the plastic viscosity Reynolds number Re p under a certain viscous effect. © 2018, Science Press. All right reserved.
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页码：2143 / 2153
页数：10
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