论文标题
界面区域的运输，用于在小直径管道中起泡到散发过渡流动
Interfacial area transport for bubbly-to-slug transition flows in small diameter pipes
论文作者
论文摘要
这项研究旨在实验研究小直径管中的两组界面区域的运输。在绝热，空气水的条件下，将重点关注的侧重于起泡到slug过渡机制的实验数据，即向两组运输区域的一组运输区域。结果表明，小直径管中的组间转移可能是剧烈的，尤其是在低表层液体速度下。这种现象的原因主要是由于与管道横截面区域相比，相对气泡尺寸较大。小球气泡在中型管道中的作用像盖或slug气泡，可以增强尾流效果。基于实验观察，本研究提供了整个群体间转移依赖性的分析。从气泡直径和空隙分数的角度来预测小直径管中急剧群间转移的模型。将这些模型与不同管道大小之间的两阶段数据进行了比较，结果表明了一个很好的一致性。这些新开发的模型通过开发类似于Sigmoid函数的过渡函数来应用于Itiate唤醒模型。通过过渡函数，修订后的模型具有预测剧烈间转移现象的新能力。
This study aims to experimentally investigate the two-group interfacial area transport in small diameter pipes. Experimental data focusing on the bubbly to slug transition regime, namely one-group to two-group transport region, are collected in a 12.7 mm vertical pipe under adiabatic, air-water conditions. The result shows the intergroup transfer in the small diameter pipe can be drastic, especially under low superficial liquid velocities. The cause of this phenomenon is mainly due to the large relative bubble size comparing to the pipe cross-sectional area. The wake entrainment effect could be enhanced by the small spherical bubbles that are acting like cap or slug bubbles in a medium-size pipe. Based on the experimental observation, a throughout analysis of the dependence of the drastic intergroup transfer is provided in this study. The models predicting the initiation of drastic intergroup transfer in small diameter pipes in terms of the bubble diameter and the void fraction are developed. These models are compared with the two-phase data among the different pipe sizes and the results show a good agreement. These newly developed models are applied to the IATE wake entrainment model by developing a transition function analogous to the sigmoid function. With the transition function, the revised IATE model is given the new ability on predicting the drastic intergroup transfer phenomenon.
