When dense paste transports in pipe, the pressure loss is enormous. To make use of the wall slip phenomenon, different liquids were injected into the boundary layer in horizontal pipe and pressure loss per unit reduces. Through the pipe transportation tests, the effect of different factors to the resistance was analysed respectively, such as the thickness of boundary layer, the concentration of material, the type of drag reducer, the transport velocity and the flow rate. Results show that the drag reduction effect is much better with a higher thickness and lower transport velocity, and also obtains that PEO (Polyethylene oxide) solution as boundary layer is much more effective than water. With analysis of variance and significance test, the influence degree of the three main factors on the transport resistance is sorted as the thickness of the boundary layer, paste concentration, pipe diameter. The thickness of boundary layer has the greatest influence on the transport resistance. All conclusions provide a basis for how to use the boundary layer rationally in engineering paste pipeline transportation system.

中文翻译：

---

利用边界液注入管内输送稠密膏体的减阻特性

稠密膏体在管道中输送时，压力损失巨大。利用壁面滑移现象，在水平管的边界层注入不同的液体，降低了单位压力损失。通过管道输送试验，分别分析了边界层厚度、材料浓度、减阻剂类型、输送速度和流量等不同因素对阻力的影响。结果表明，厚度越大，输运速度越低，减阻效果越好，并且得到PEO（聚环氧乙烷）溶液作为边界层比水更有效。用方差分析和显着性检验，三个主要因素对输运阻力的影响程度依次为边界层厚度、膏体浓度、管径。边界层的厚度对输运阻力的影响最大。所有结论为工程膏体管道输送系统如何合理利用边界层提供了依据。