Investigation on Gas-Liquid Two-Phase Flow Patterns across an In-Line Tube Bundles

Hong Wenpeng, Liu Yunlong, Liu Yan
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Abstract

A high-speed video camera was used to study the flow patterns in the rectangular channel of vertical upward cross-flow of air and water in horizontal tube bundles. Experiments were conducted using in-line tube bundles with a pitch-to-diameter ratio of 1.3 and 1.8. Bubbly flow, intermittent flow and mist flow were identified by flow visualization, and a flow map was constructed as a function of gas and liquid superficial velocities. The information of a single-frame was extracted and made into time series. The recurrence quantification analysis method was used to study the dynamic characteristics of information entropy of gas-liquid two phase typical flow patterns and transition flow patterns. The results show that the recurrence plot of entropy series of transition flow patterns shows the process of flow transition. The characterization result showed that the recurrence plot of information entropy could well reflect the evolution characteristics of flow pattern, and the recurrence characteristics quantities were sensitive to the variations of superficial gas velocity and provided an auxiliary tool for investigation of gas-liquid two-phase flow mechanism.
直列管束气液两相流型研究
利用高速摄像机研究了水平管束中空气与水垂直向上交叉流动矩形通道内的流动规律。采用节径比分别为1.3和1.8的直列管束进行了实验。利用流动显示技术对气泡流、间歇流和雾状流进行识别,并构建了气液表面流速的函数流图。提取单帧信息,并将其制作成时间序列。采用递归量化分析方法研究了气液两相典型流型和过渡流型的信息熵动态特性。结果表明,过渡流型熵序列递推图反映了流动过渡的过程。表征结果表明,信息熵递归图能较好地反映流型演化特征,且递归特征量对表面气速变化较为敏感,为研究气液两相流动机理提供了辅助工具。
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