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首页> 外文期刊>International Journal of Multiphase Flow >Slug initiation and evolution in two-phase horizontal flow
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Slug initiation and evolution in two-phase horizontal flow

机译：两相水平流中的团状萌生和演化

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A series of two-phase air-water experiments was carried out in order to study the initiation and the subsequent evolution of hydrodynamic slugs in a horizontal pipeline. Experiments were carried out at atmospheric pressure, 4.0 bar(a) and 9.0 bar(a), and the effects of superficial liquid and gas velocities were investigated. The test section used for these experiments is 37 m in length, with an internal diameter of 0.078 m. To study the interfacial development, measurements of interfacial structures were made at 14 axial locations along the test section, with data acquired at a sampling frequency of 500 Hz. A large number of slugs were initiated within the first 3 m of the test section, with the frequency subsequently reducing towards the fully developed value before the end of the pipe. This reduction in frequency was strongly influenced by the magnitude of the gas and liquid velocities. The frequency of slugging was not strongly affected when the system pressure was changed from 1 atmosphere, to 4.0 and 9.0 bar(a), closely similar values being obtained at the 10 downstream locations. However, higher pressure delayed the onset of slug initiation, with "slug precursors" being formed further downstream as the pressure was increased. The statistical distributions of slug lengths and of the time intervals between slug arrivals were examined in detail and compared to several standard distributions. This showed that slug initiation may be reasonably approximated as an uncorrelated Poisson process with an exponential distribution of arrival times. However, once slugs have developed, there is strong correlation and the arrival time intervals, as well as the lengths, are best represented by the log-normal distribution. (c) 2006 Elsevier Ltd. All rights reserved.
机译：为了研究水平管道中流体动力塞的产生和随后的演化，进行了一系列的两阶段空气-水实验。在大气压，4.0 bar（a）和9.0 bar（a）的条件下进行实验，并研究了表观液体和气体速度的影响。这些实验使用的测试段长度为37 m，内径为0.078 m。为了研究界面发展，在沿测试部分的14个轴向位置进行了界面结构的测量，并以500 Hz的采样频率获取了数据。在测试段的前3 m内引发了许多段塞，随后在管道末端之前频率逐渐降低到完全展开的值。频率的降低在很大程度上受到气体和液体速度的影响。当系统压力从1个大气压更改为4.0和9.0 bar（a）时，拍击的频率没有受到很大的影响，在10个下游位置获得了非常相似的值。然而，较高的压力延迟了团状引发的开始，随着压力增加，“团状前体”在下游形成。详细研究了团块长度和团块到达之间的时间间隔的统计分布，并与几种标准分布进行了比较。这表明，团状引发可以合理地近似为不相关的泊松过程，其到达时间呈指数分布。但是，一旦团块形成，就具有很强的相关性，到达时间间隔以及长度最好用对数正态分布表示。 （c）2006 Elsevier Ltd.保留所有权利。

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