气力提升管内流型识别的实验研究

以压缩空气、水和麦饭石陶瓷颗粒作为实验介质,利用高速摄像仪对气力提升管内的气液两相流流型及气液固三相流流型进行可视化分析识别。实验结果表明,采用高速摄像技术有效识别了气力提升管内的流型,观察到气液两相流中存在着4种流型:泡状流、弹状流、泡沫流、环状流。以气液两相流流型特征为基础参考,将观察到的气液固三相流流型归分为弹旋流、旋涡流、波浪流、聚泡流和环柱流5种。并对各流型间的转变机理进行了分析阐述。

An Experimental Study on Flow Pattern Identification of Air-Lift Pipes

The experimental medium are compressed air, water and medical stone ceramic particles in this paper. The gas-liquid two-phase flow pattern and the gas-liquid-solid three-phase flow pattern in the air-lift pipe were visualized analyzed and identified by high-speed camera technology. The results of experiment show that the high-speed camera technology can effectively identify the flow pattern. It is observed that there are four kinds of flow patterns in gas-liquid two-phase flow: bubble flow, slug flow, churn flow and annular flow. Base on the flow pattern characteristics of gas-liquid two-phase flow, the gas - liquid - solid three-phase flow pattern can be divided into five flow patterns: slug- spiral flow, vortical-spiral flow, wave flow, coalesced churn flow, and annular column flow. In addition, the mechanism of the transition between the flow pattern is discussed.