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Development of new correlations for annular flow

机译：开发环形流动的新关联

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Annular two-phase flow has been vastly investigated due to its large and deep involvement in a large amount of industrial processes, for instance, petroleum, chemical, civil and nuclear industries, and particularly in boiling and condensing heat transfer equipment. Annular flow is characterized by a thin liquid film flowing on the pipe wall and a high velocity gas core flowing in its centre, which normally carries liquid droplets. This work reviews most of the recent literature on the matter, with emphasis in all important variables which control the annular flow. This work focuses on the processes occurring in the liquid-gas interface that cause droplet entrainment, addressing also the characterization of these entrained droplets. This paper shows the existing scattering when key variables expressions are compared to each other and it highlights the gaps of knowledge still existing. Additionally, based on some of the open experimental data, alternate equations for liquid film thickness, wave celerity, wave frequency, droplet sizes and total droplet amount, have been derived for annular flow. The performance of the correlations derived is shown to enhance the existing predictability. It is noteworthy that the correlations derived are based on non-dimensional numbers, which makes them suitable for their application to a broader set of scenarios (i.e., fluids, geometry and so on).
机译：由于环形两相流广泛深入地参与了许多工业过程，例如石油，化学，民用和核工业，特别是在沸腾和冷凝式传热设备中，因此已经得到了广泛的研究。环形流动的特征是在管壁上流动着一层薄的液体膜，在其中心流动着一个高速气芯，该气芯通常携带着液滴。这项工作回顾了有关该问题的最新文献，重点是控制环形流动的所有重要变量。这项工作的重点是在液-气界面上发生的导致液滴夹带的过程，还解决了这些夹带液滴的特征。本文显示了将关键变量表达式进行相互比较时存在的散射，并突出了仍然存在的知识空白。另外，基于一些开放的实验数据，已经推导出了用于环形流动的液膜厚度，波速，波频率，液滴尺寸和总液滴量的替代方程式。所显示的相关性的性能显示出可以增强现有的可预测性。值得注意的是，得出的相关性基于无量纲数，这使其适用于更广泛的场景集（即流体，几何体等）。

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