Laminar and turbulent flow of cement slurries in large diameter pipe: A comparison with laboratory viscometers
Laminar and turbulent flow of cement slurries in large diameter pipe: A comparison with laboratory viscometers
复制标题
大直径管道中水泥浆的层流和湍流：与实验室粘度计的比较
DOI：
10.1122/1.550223
复制
发表时间：
1991
影响因子：
3.3
通讯作者：
R. Mannheimer
中科院分区：
文献类型：
--
作者：
R. Mannheimer
本文的主要目的是说明用实验室粘度计测量水泥浆表观粘度的固有问题，并使用这些测量值来估计大型管道中的摩擦系数和流动状态。用Couette和管粘度计获得的实验测量结果显示出明显的壁面滑移，在屈服值附近的剪切应力下达到100%的极限值。然而，在对这些数据进行滑移校正后，获得了相当的表观粘度。还介绍了粘土和水泥浆在大直径管道中层流、过渡流和湍流的实验结果。结果表明，湍流的发生在一个临界雷诺数，这是在很好的协议与预测值，流变特性是基于大规模的管流数据。然而，由于尚未解释的原因，从大型设施中取出的水泥样品具有更高的表观粘度。
The primary objective of this paper is to illustrate the inherent problems of measuring the apparent viscosity of cement slurries with laboratory viscometers and using these measurements to estimate friction factors and flow regimes in large‐scale pipes. Experimental measurements obtained with Couette and tube viscometers are shown to exhibit an apparent wall slip that reaches a limiting value of 100% at shear stresses near the yield value. Nevertheless, comparable apparent viscosities are obtained after these data are corrected for slip. Experimental results for the laminar, transitional, and turbulent flows of clay and cement slurries in a large‐diameter pipe are also presented. It is shown that the onset of turbulence occurs at a critical Reynolds number that is in good agreement with the predicted value, provided that rheological properties are based on large‐scale pipe‐flow data. However, for yet unexplained reasons, samples of cement taken from the large‐scale facility had much higher apparent visco...