Abstract

The paper presents results of experimental study of an upward flow in a vertical rod bundle consisting of nine rods arranged in a square. Spacing grids were used to keep the bundle geometry. The experiments were performed in single-phase and bubbly flows using an electrochemical technique. A local wall shear stress probe was mounted in the central rod. The dependence of the local wall shear stress on the distance from the grid was measured for two angular positions of the central rod. The wall shear stress fluctuations were also measured. The effect of gas phase void fraction on the flow parameters was studied.

中文翻译：

---

3·3杆束模型中的壁剪应力

摘要

本文介绍了由垂直排列的九根杆组成的垂直杆束中向上流动的实验研究结果。间距网格用于保持束的几何形状。实验是使用电化学技术在单相和气泡流中进行的。局部壁剪应力探头安装在中心杆中。对于中心杆的两个角位置，测量了局部壁面剪应力对距网格的距离的依赖性。还测量了壁剪应力的波动。研究了气相空隙率对流动参数的影响。