(1. 华北科技学院 安全工程学院，廊坊 065201
2. 北京科技大学 资源与环境工程学院，北京 100083)
摘 要: 管道输送是尾矿膏体处置的关键工艺，膏体尾矿具有非牛顿流体特性，在流动中伴随有管壁滑移效应。为实现对膏体管内流动阻力的精确测算，基于非牛顿流体力学及表观滑移假说，通过理论分析将膏体管内流动划分为柱塞区、剪切区及滑移区，结合宾汉流变模型，分析不同区域流速、应力及流量的分布状态，构建膏体管道输送的流量平衡方程，推导出膏体管内滑移流动的阻力公式。开展环管试验，利用实测数据对阻力公式进行适应性分析及验证。结果表明：膏体管内流动中存在壁面滑移现象，流量20~40 m3/h条件下，样品在DN100管道内流动阻力为4000~5000 Pa/m，在DN150管道内流动阻力为2400~2600 Pa/m，滑移流动阻力公式与实测值的误差约为10%，满足工程应用的精度要求。
关键字: 膏体尾矿；管道输送；管流阻力；管壁滑移；滑移速度
（1. School of Safety Engineering, North China Institute of Science & Technology, Langfang 065201, China;
2. School of Civil and Resources Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China）
Abstract:Pipeline transportation is the key process of tailings paste disposal, paste tailing is a kind of typical non-Newtonian fluids, and has obvious wall slip effect in pipe flow. For accurately calculating the pipe flow resistance of paste tailings, the pipe flow of paste was divided into plug zone, shear zone and slip zone through theoretical analysis, based on non-Newtonian fluid mechanics and apparent wall slip hypothesis. Paste tailings were regarded as Bingham fluid, and the distributions of stress, velocity and flow rate in different flow zones were analyzed, a flow equilibrium equation of paste pipeline transportation was put forward. Finally, a resistance formula with wall slip effect in pipe was established. A loop test was conducted to prove and verify the formula. The results show that the wall slip phenomenon exists in paste tailings pipe flow, and the pipe flow resistance is 4000-5000 Pa/m in DN100 pipe and 2400-2600 Pa/m in DN150 pipe, when the flow rate is 20-40 m3/h. The error of the calculated value by flow resistance formula considering effect of wall slip is about 10%, which meets the precision requirements of engineering application.
Key words: paste tailings; pipeline transportation; pipe flow resistance; wall slip; slip velocity
