论文标题
在12.7毫米ID垂直管中起泡到散发过渡流的两相界面结构
Two-phase interfacial structure of bubbly-to-slug transition flows in a 12.7 mm ID vertical tube
论文作者
论文摘要
这项实验研究的重点是空气两相界面结构的特征。界面参数，包括空隙分数，界面面积浓度和气泡界面速度，使用12.7 mm ID垂直管上的四传感器电导率探针测量。管尺寸大约等于最大扭曲的气泡尺寸。因此，起泡到散发的过渡特性可能与其他尺寸的管子不同。与以前的研究相比，本研究提供了一个实验数据库，其在起泡到散发的过渡流方面具有较宽的范围，具有4个不同的表面液体速度（0.3、0.5、1.0和2.0 m/s），范围为0.07至0.66。实验结果表明，壁峰空隙分布不会出现在气泡到散发流动过渡流下的小直径管中。该分布与空隙分数和与管尺寸的相对气泡大小相关。从这个意义上讲，根据Ishii和Hibiki等人的先前研究，提出了漂流通量模型中分布参数的新相关性。这项实验研究可能是流动状态过渡和界面区域传输方程的模型发展的良好参考。
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.
