薛婷^1,2, 李卓林^1,2
AuthorsHTML:薛婷^1,2, 李卓林^1,2
AuthorsListE:Xue Ting^1,2, Li Zhuolin^1,2
AuthorsHTMLE:Xue Ting^1,2, Li Zhuolin^1,2
Unit:1. 天津大学电气自动化与信息工程学院，天津 300072；2. 天津市过程检测与控制重点实验室，天津 300072
Unit_EngLish:1. School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2. Tianjin Key Laboratory of Process Measurement and Control, Tianjin 300072, China
Abstract_Chinese:针对管道中距离U型管不同位置处的竖直向上环状流轴向液膜分布, 基于平面激光诱导荧光(PLIF)技术, 设计并搭建了内径为25mm的气液两相流循环装置, 采用高速摄影获取距离U型管不同位置处的液膜荧光图像, 并通过数字图像处理技术进行特征提取．结果表明：当距离U型管达到25倍管径时, U型管对液膜发展及分布影响显著降低; 将获得的平均液膜厚度数据与液膜厚度经典预测模型进行对比分析, 表明在此距离时竖直向上环状流液膜发展及分布稳定．
Abstract_English:In this study，to investigate the longitudinal liquid film distribution of upward annular flow at different positions from the U-bend，a gas-liquid two-phase flow circulating device with an inner diameter of 25mm was designed and constructed based on the planar laser-induced fluorescence(PLIF)technique. The liquid film fluorescence images at different positions from the U-bend were obtained using high-speed photography，and the liquid film thickness features were extracted using digital image processing. The experimental results show that when flow reached an axial distance of 25 times the diameter from U-bend，the effects of the U-bend film thickness on the development and distribution of the liquid film were significantly reduced; in addition，the average liquid film thickness measurement data were compared with the relevant classical film thickness prediction models，and the results show that upward annular flow is reasonably developed and distributed at this position.
Keyword_Chinese:竖直向上环状流; 液膜厚度; 平面激光诱导荧光; U型管
Keywords_English:upward annular flow; liquid film thickness; planar-laser induced fluorescence(PLIF); U-bend

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