12.7 mm ID垂直管内气泡-弹状过渡流两相界面结构
Two-phase interfacial structure of bubbly-to-slug transition flows in a 12.7 mm ID vertical tube
摘要：
本实验主要研究空气-水两相界面结构的特性。界面参数，包括空隙率，界面面积浓度，和气泡界面速度测量使用四传感器电导率探头上的12.7毫米ID的垂直管。管尺寸大约等于最大扭曲气泡尺寸。因此，气泡-段塞过渡特性可能与其他尺寸的管不同。与以往的研究相比，本研究提供了一个实验数据库，具有广泛的范围内的气泡段塞过渡流，与4个不同的表观液体速度（0.3，0.5，1.0，和2.0米/秒）和空隙率范围从0.07到0.66。实验结果表明，在泡状流-弹状流过渡流条件下，小管径管道内不会出现壁面峰值空泡分布。该分布与空泡率和相对于管尺寸的气泡尺寸有关。在此基础上，本文在Ishii和Hibiki等人的研究基础上，提出了一种新的漂移通量模型中分布参数的关联式，为流态转换模型和界面面积输运方程的建立提供了参考。
英文摘要：
This experimental study focuses on the characteristics of air-water two-phase interfacial structure. Interfacial parameters including void fraction, interfacial area concentration, and bubble interfacial velocity are measured using four-sensor electrical conductivity probe on a 12.7 mm ID vertical tube. The tube size is approximately equal to the maximum distorted bubble size. Therefore, the bubbly-to-slug transition characteristics can be different from in other sizes of tubes. Comparing with previous studies, this study provides an experimental database with a wide range on the bubbly-to-slug transition flows, with 4 different superficial liquid velocities (0.3, 0.5, 1.0, and 2.0 m/s) and void fraction ranging from 0.07 to 0.66. Experimental results show that the wall-peak void distribution does not appear in a small diameter tube under the bubbly-to-slug flow transition flow. The distribution is related with both void fraction and the relative bubble size to the tube size. In this sense, a new correlation of distribution parameter in the Drift Flux model is proposed based on the previous studies by Ishii and Hibiki et al. This experimental study can be a good reference for the model development of flow regime transition and the Interfacial Area Transport Equation.
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