Abstract

As an efficient and environmentally friendly method of delivering solid particles, the transport of liquid–solid slurry through a pipeline has attracted considerable attention. However, the flow characteristics of the slurry in large-diameter pipes, especially multi-sized slurry, are far from fully understood. In this study, an Eulerian multiphase model is applied to investigate single- and multi-sized slurry flows in horizontal pipes. The results show that the pipe diameter has a distinct effect on the particle distribution and that the flow properties of multi-sized slurry are different from those of single-sized slurry. In the 900-mm pipe, the variations in the solid concentration and velocity distributions of single-sized slurry are significantly affected by the particle size and efflux concentration but display weak dependence on the mixture velocity. The total particle concentration profile of the multi-sized slurry becomes relatively symmetric in the upper half of the pipe and highly asymmetric in the lower half with increasing mean particle size. The pressure drop per meter of the single-sized slurry first decreases and then increases with increasing particle size, and the pressure drop of the multi-sized slurry containing coarse particles is much higher than that of the single-sized slurry under the same working conditions.

摘要

作为一种高效、环保的固体颗粒输送方法，通过管道输送液-固浆液引起了广泛关注。然而，大口径管道中泥浆的流动特性，尤其是多尺寸的泥浆，还远未完全了解。在这项研究中，应用欧拉多相模型来研究水平管道中的单尺寸和多尺寸泥浆流。结果表明，管径对颗粒分布有明显的影响，多粒度浆料的流动特性与单粒度浆料不同。在 900 毫米管道中，单一粒度浆料的固体浓度和速度分布的变化受粒度和流出浓度的显着影响，但对混合速度的依赖性较弱。随着平均粒径的增加，多尺寸浆料的总颗粒浓度分布在管道的上半部分变得相对对称，而在下半部分变得高度不对称。单粒料浆每米压降随着粒径的增大先减小后增大，在相同工况下，含粗颗粒的多粒料浆的压降远高于单粒料浆的压降. 随着平均粒径的增加，多尺寸浆料的总颗粒浓度分布在管道的上半部分变得相对对称，而在下半部分变得高度不对称。单粒料浆每米压降随着粒径的增大先减小后增大，在相同工况下，含粗颗粒的多粒料浆的压降远高于单粒料浆的压降. 随着平均粒径的增加，多尺寸浆料的总颗粒浓度分布在管道的上半部分变得相对对称，而在下半部分变得高度不对称。单粒料浆每米压降随着粒径的增大先减小后增大，在相同工况下，含粗颗粒的多粒料浆的压降远高于单粒料浆的压降.