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首页> 外文期刊>International Journal of Heat and Fluid Flow >Turbulence modification in vertical upward annular flow passing through a throat section
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Turbulence modification in vertical upward annular flow passing through a throat section

机译：穿过喉部的垂直向上环形流动中的湍流变化

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摘要

Experimental studies on the turbulence modification in annular two-phase flow passing through a throat section were carried out. The turbulence modification in multi-phase flow due to the interactions between two-phases is one of the most interesting scientific issues and has attracted research attention. In this study, the gas-phase turbulence modification in annular flow due to the gas-liquid phase interaction is experimentally investigated. The annular flow passing through a throat section is under the transient state due to the changing cross sectional area of the channel and resultantly the superficial velocities of both phases are changed compared with a fully developed flow in a straight pipe. The measurements for the gas-phase turbulence were precisely performed by using a constant temperature hotwire anemometer, and made clear the turbulence structure such as velocity profiles, fluctuation velocity profiles. The behavior of the interfacial waves in the liquid film flow such as the ripple or disturbance waves was also observed. The measurements for the liquid film thickness by the electrode needle method were also performed to measure the base film thickness, mean film thickness, maximum film thickness and wave height of the ripple or the disturbance waves.
机译：进行了穿过喉部的环形两相流湍流变化的实验研究。由于两相之间的相互作用而引起的多相流湍流变化是最有趣的科学问题之一，并引起了研究的关注。在这项研究中，实验研究了由于气-液相相互作用在环形流中的气相湍流变化。由于通道横截面积的变化，穿过喉部的环形流动处于过渡状态，因此与直管中完全展开的流动相比，两相的表观速度都发生了变化。气相湍流的测量是通过使用恒温热线风速仪精确进行的，并明确了湍流的结构，例如速度分布，波动速度分布。还观察到了液膜流中的界面波的行为，例如波纹或干扰波。还通过电极针法进行了液膜厚度的测量，以测量基膜厚度，平均膜厚度，最大膜厚度和波纹或干扰波的波高。

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