Gas-liquid slug flow in horizontal pipes occurs frequently in industrial applications and is harmful to the piping systems owing to its intermittent structures. Therefore, it is essential to accurately describe the flow structure and investigate the flow mechanism. A non-intrusive fluorescence imaging method is employed to quantitatively reconstruct the slug bubble in a 15mm ID horizontal pipe in this article. Optical distortion correction method is firstly developed to improve the measurement accuracy of the instantaneous gas holdup, and then the time-average axial bubble velocity is simultaneously measured according to the feature matching of cross-sectional images. Additionally, the influence of phase superficial velocity on the interface stability is investigated through the phase holdup and the circumferential curvature distribution analysis. The typical three-dimensional structures of slug bubble are finally reconstructed through the velocity-based bicubic interpolation and median fusion algorithm. Previous correlations and reference instrumentation are used to evaluate the proposed method. Comparison results show that the method can effectively measure the flow parameters and reconstruct slug bubbles.

中文翻译：

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团状流的三维特征测量

水平管中的气液塞流在工业应用中经常发生，并且由于其间断的结构而对管道系统有害。因此，准确描述流场结构和研究流场机理至关重要。本文采用非侵入式荧光成像方法定量重建15mm内径水平管中的弹状气泡。首先开发光学畸变校正方法，以提高瞬时气体滞留量的测量精度，然后根据横截面图像的特征匹配，同时测量时间平均轴向气泡速度。另外，通过相保持率和周向曲率分布分析，研究了相表观速度对界面稳定性的影响。最后，通过基于速度的双三次插值和中值融合算法，重构了ug形气泡的典型三维结构。先前的相关性和参考仪器用于评估所提出的方法。对比结果表明，该方法可以有效地测量流量参数并重构团状气泡。