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中南大学学报(自然科学版)

Journal of Central South University

第50卷    第1期    总第293期    2019年1月

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文章编号:1672-7207(2019)01-0172-08
膏体料浆管道输送中粗骨料颗粒运动规律分析
颜丙恒1, 2,李翠平1, 2,吴爱祥1, 2,王洪江1, 2,侯贺子1, 2

(1. 北京科技大学 土木与资源工程学院,北京,100083;
2. 金属矿山高效开采与安全教育部重点实验室,北京,100083
)

摘 要: 为分析粗骨料膏体料浆在管道输送时因剪切诱导作用而使粗骨料颗粒产生的相对运动,以全尾砂膏体料浆能够限制尾砂颗粒的沉降运动为出发点,将全尾砂膏体料浆视为伪匀质悬浮液,将不具有流变活性的粗骨料颗粒视为被承载固体。依据粗骨料膏体管道输送时的流速分布特性,构建具有剪切流动区与非剪切流动区的复合流动模型。通过宏观颗粒模型MPM研究粗骨料颗粒的运动规律,分析粗骨料颗粒在X轴、Y轴和Z轴方向上的位移与线速度。研究结果表明:粗骨料颗粒在剪切流动区域内存在较明显的径向偏移与轴向差速运动,粗骨料颗粒在剪切流动区域内发生相对运动的主要原因为径向的流速梯度引起颗粒的自旋转。通过数值计算结果与理论分析的对比,说明复合流动模型描述粗骨料颗粒运动的可行性以及相对运动原因的可信性。

 

关键字: 粗骨料颗粒;复合流动模型;MPM模型;剪切流动区;非剪切流动区

Analysis of law of movement of coarse aggregate particles in pipeline transportation of paste
YAN Bingheng1, 2, LI Cuiping1, 2, WU Aixiang1, 2, WANG Hongjiang1, 2, HOU Hezi1, 2

1. School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. State Key Laboratory of High-Efficient Mining and Safety of Metal Mines,
Ministry of Education, Beijing 100083, China

Abstract:To analyze the relative motion of coarse aggregate particles caused by shear-induced effect in pipeline transportation of paste, the fact that unclassified tailing paste could limit the sedimentation of tailing particles was considered as the starting point; unclassified tailing paste was regarded as pseudo-homogeneous suspensions and coarse aggregate particles without rheological properties was deemed as solid particles being loaded. With the characteristics of velocity profile in pipeline transportation of paste being considered, a composite flow model with shear flow region and non-shear flow region was built. The law of movement of coarse aggregate particle was studied by macroscopic particle model (MPM). Analysis of the displacement and linear velocity of coarse aggregate particles in X-axis, Y-axis and Z-axis was conducted. The results show that coarse aggregate particles have obvious radial deviation and axial differential motion in the shear flow region, and the main reason for the relative motion of coarse aggregate particles in the shear flow region is the spin of particles caused by the radial velocity gradient. Numerical results are compared with the results of the theoretical analysis. Feasibility of describing the movement of coarse aggregate particles and credibility of describing reasons of relative motion by using composite flow model are explained.

 

Key words: coarse aggregate particles; composite flow model; macroscopic particle model; shear flow region; non-shear flow region

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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