Measurements of wall shear stress in horizontal air-water bubbly flows

被引：5

作者：

Su, Yuliang ^{[1
,2
]}

Zhang, Mingyuan ^{[1
]}

Zhu, Xianran ^{[1
]}

Hu, Qihui ^{[1
]}

Geng, Yanhong ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, State Key Lab Multiphase Flow Power Engn, Xian 710049, Shaanxi, Peoples R China

[2] China Univ Petr, Dept Petr Engn, Dongying 257061, Shandong, Peoples R China

来源：

FLOW MEASUREMENT AND INSTRUMENTATION | 2010年 / 21卷 / 03期

基金：

美国国家科学基金会;

关键词：

Horizontal air-water bubbly flow; Wall shear stress; Entrance length; Hot film probe; Asymmetrical phase distribution; GAS-LIQUID FLOW; 2-PHASE FLOW; PROBE; PIPE;

D O I：

10.1016/j.flowmeasinst.2010.04.008

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

The mean and time-varying fluctuation property of local wall shear stress of horizontal air-water bubbly flows in a circular pipe of 35 mm I.D. is measured using a TSI-1268W hot film probe. Data are collected in both entrance and developed regions of the flows. The variation of wall shear stress with L/D is analyzed, and the entrance length is determined to be 52-65 D at present studies. It is found that the wall shear stress is not uniform around the pipe circumference due to the asymmetrical phase distribution in the flows. The mean shear stress tends to decrease circumferentially from the pipe bottom to top. An increase of air flow rate at a constant water flow rate would further lower the wall shear stress at the upper part of the pipe and at the same time raise the wall shear stress at lower part of the pipe in both entrance and developed regions. An increase of water flow rate at a constant air flow rate would result in an increase of wall shear stress at all circumferential positions. The statistical property of wall shear stress is also discussed. (C) 2010 Published by Elsevier Ltd

引用

页码：373 / 381

页数：9

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