(1. 華北科技學院 安全工程學院，廊坊 065201
2. 北京科技大學 資源與環(huán)境工程學院，北京 100083)
摘 要: 管道輸送是尾礦膏體處置的關鍵工藝，膏體尾礦具有非牛頓流體特性，在流動中伴隨有管壁滑移效應。為實現(xiàn)對膏體管內(nèi)流動阻力的精確測算，基于非牛頓流體力學及表觀滑移假說，通過理論分析將膏體管內(nèi)流動劃分為柱塞區(qū)、剪切區(qū)及滑移區(qū)，結(jié)合賓漢流變模型，分析不同區(qū)域流速、應力及流量的分布狀態(tài)，構(gòu)建膏體管道輸送的流量平衡方程，推導出膏體管內(nèi)滑移流動的阻力公式。開展環(huán)管試驗，利用實測數(shù)據(jù)對阻力公式進行適應性分析及驗證。結(jié)果表明：膏體管內(nèi)流動中存在壁面滑移現(xiàn)象，流量20~40 m3/h條件下，樣品在DN100管道內(nèi)流動阻力為4000~5000 Pa/m，在DN150管道內(nèi)流動阻力為2400~2600 Pa/m，滑移流動阻力公式與實測值的誤差約為10%，滿足工程應用的精度要求。
關鍵字: 膏體尾礦；管道輸送；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
