On elongated air pockets in downward sloping pipes

IVO POTHOF; FRANCOIS CLEMENS

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On elongated air pockets in downward sloping pipes

机译：在向下倾斜的管道中的细长气穴上

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The behaviour of elongated air pockets in downward sloping pipes is investigated. The observed flow regimes in co-current air-water flow in downward sloping pipes are described. The effects of pipe diameter and surface tension on the air pocket motion are quantified and two criteria for the observed flow regime transitions are derived. One criterion stems from energy considerations and marks the transition from the presence of one elongated air pocket to multiple air pockets. The second criterion predicts the required water velocity to start the motion of elongated air pockets in the downward direction. Both criteria were validated with experimental data for a range of downward sloping pipe angles, lengths and diameters.

机译：研究了向下倾斜的管道中细长气穴的行为。描述了在向下倾斜的管道中顺流空气-水流中观察到的流态。量化了管径和表面张力对气穴运动的影响，并得出了两个观察到的流态转变的标准。一个标准是基于能量的考虑，并标志着从一个细长的气袋到多个气袋的过渡。第二个标准预测开始拉长的气穴向下运动所需的水速。两项标准均已通过一系列向下倾斜的管角，长度和直径的实验数据进行了验证。

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来源
《Journal of hydraulic research》 |2010年第4期|p.499-503|共5页
作者
IVO POTHOF; FRANCOIS CLEMENS;
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作者单位

Specialist Industrial Hydrodynamics, Deltares, PO Box 177, 2600 MH Delft,The Netherlands;

rnDepartment of Water Management, Civil Engineering and Geosciences,Delft University of Technology, PO Box 5, 2600 AA Delft, The Netherlands;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
air-water flow; bubble; bubble rise velocity; hydraulic jump; pipe flow; stratified flow; two-phase flow;

机译：空气-水流;气泡;气泡上升速度液压跳跃管道流量分层流两相流;

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2. Experimental study of air-water flow in downward sloping pipes [J] . Pothof I.W.M., Clemens F.H.L.R. International Journal of Multiphase Flow . 2011,第3期

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On elongated air pockets in downward sloping pipes

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