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首页> 外文期刊>International Journal of Multiphase Flow >Disturbance wave development in two-phase gas-liquid upwards vertical annular flow
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Disturbance wave development in two-phase gas-liquid upwards vertical annular flow

机译：气液两相向上垂直环形流中的扰动波发展

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摘要

Disturbance waves are of central importance in annular flows. Such waves are characterised by their large amplitudes relative to the mean film thickness, their high translation velocities relative to the mean film speed, and their circumferential coherence. The present paper is concerned with the existence, development and translation of disturbance waves in upwards, gas-liquid annular flows. Experiments are described, which featured simultaneous high-frequency film thickness measurements from multiple conductance probes positioned circumferentially and axially along a vertical pipe, these measurements were aimed at studying the three-dimensional development of these interfacial structures as a function of distance from the tube inlet. From the results, it is found that disturbance waves begin to appear and to achieve their circumferential coherence from lengths as short as 5-10 pipe diameters downstream of the liquid injection location; this coherence gradually strengthens with increasing distance from the inlet. It is further shown that the spectral content of the entire interfacial wave activity shifts to lower frequencies with increasing axial distance from the inlet, with the peak frequency levelling off after approximately 20 pipe diameters. Interestingly, on the other hand, the frequency of occurrence of the disturbance waves first increases away from the inlet as these waves form, reaches a maximum at a length between 7.5 and 15 pipe diameters that depends on the flow conditions, and then decreases again. This trend becomes increasingly evident at higher gas and/or liquid flow-rates. Both wave frequency measures increase monotonically at higher gas and/or liquid flow-rates.
机译：扰动波在环形流动中至关重要。这样的波的特征在于其相对于平均膜厚度的大幅度，相对于平均膜速度的高平移速度以及其周向相干性。本文涉及扰动波在向上，气液环形流动中的存在，发展和转化。描述了实验，这些实验的特征是通过沿垂直管沿周向和轴向放置的多个电导探针同时进行高频膜厚测量，这些测量旨在研究这些界面结构的三维发展，作为距管入口距离的函数。从结果可以发现，扰动波从出现在液体注入位置下游的短至5-10管径的长度开始出现并达到其周向相干性。随着与入口的距离增加，这种连贯性逐渐增强。进一步显示，随着距入口轴向距离的增加，整个界面波活动的频谱含量向较低的频率移动，在大约20个管道直径后，峰值频率趋于平稳。另一方面，有趣的是，扰动波的发生频率随着这些波的形成首先从入口处增加，并在7.5至15倍的管道直径（取决于流量条件）的长度处达到最大值，然后再次降低。在较高的气体和/或液体流速下，这种趋势变得越来越明显。在较高的气体和/或液体流速下，两种波频率测量都单调增加。

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