Turbulent Flow in the Entry Region of a Rough Pipe
Turbulent Flow in the Entry Region of a Rough Pipe
复制标题
粗糙管道入口区域的湍流
DOI：
10.1115/1.3447099
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发表时间：
1974
影响因子：
2
通讯作者：
J. P. Tullis
中科院分区：
文献类型：
--
作者：
Jeng;J. P. Tullis
本文研究了圆管入口段平均湍流的一般特性。研究了壁面切应力、速度分布、核心速度和边界层厚度的发展。本文提出了一个预测发展流边界层增长的数学模型。使用动量和连续性方程，并假设（1）核心区域的势流，（2）边界层的半对数速度分布，以及（3）根据实验数据得出的实测阻力公式。结果表明，该模型可以令人满意地预测在前10至12个管道直径。实验数据是在直径为12英寸的水力粗糙管中获得的。湍流被抑制，并通过具有收敛喷嘴的沉降室形成发展边界层。水被用作流体。
General characteristics of mean turbulent flow in the entry region of a pipe were investigated. The development of wall shear stress, velocity profile, core velocity, and boundary layer thickness was studied. A mathematical model for predicting boundary layer growth in developing flow is presented. Momentum and continuity equations were used with assumptions of (1) potential flow in the core region, (2) a semi-log velocity profile for the boundary layer, and (3) a measured resistance formula from the experimental data. Results show that the model can predict satisfactorily within the first 10 to 12 pipe diameters. The experimental data were obtained in a 12-inch diameter hydraulically rough pipe. Turbulence was suppressed and a developing boundary layer was formed by a settling chamber with a converging nozzle. Water was used as the fluid.