A thorough understanding of the behaviour of the transition from plug to slug flow is imperative based on the fact that the transition can trigger an abrupt radial pressure variation. This can bring about major vibrations to the pipeline and also lead to big differences in pressure gradient and wall temperature. Unfortunately, the transition from plug to slug flow is poorly understood due to the scarce availability of experimental data. Furthermore, a considerable amount of research on the transition from plug to slug flow in the literature is based on an air–water system. In this work, the transition behaviour from plug to slug flow in a horizontal pipeline was experimentally investigated using electrical capacitance tomography (ECT). Working fluids are air–silicone oil. The work was carried out over a range of liquid and gas superficial velocities of 0.05–0.47 m/s and 0.05–4.7 m/s, respectively. Wave growth and wave characteristics mechanisms were observed to be responsible for the transition from plug to slug flow based on the obtained experimental results. Both liquid and gas superficial velocities have a major influence also on these mechanisms. The drift flux parameters for the transition from plug to slug flow was determined. A reasonably good agreement was observed from the comparison between present experimental data against hitherto published empirical models and correlations.

基于这种转变会触发突然的径向压力变化这一事实，必须彻底理解从旋塞到塞状流的转变行为。这会给管道带来巨大的振动，并导致压力梯度和壁温的巨大差异。不幸的是，由于缺乏实验数据，人们对从塞流到团塞流的转换了解甚少。此外，文献中从塞流到团状流过渡的大量研究都是基于空气-水系统。在这项工作中，使用电容层析成像（ECT）实验研究了水平管道中从塞流到塞流的过渡行为。工作流体是空气硅油。这项工作分别在0.05-0.47 m / s和0.05-4.7 m / s的液体和气体表观速度范围内进行。根据获得的实验结果，观察到波的增长和波的特征机制是导致塞子流向段塞流过渡的原因。液体和气体的表面速度都对这些机理也有重要影响。确定了从塞流到团状流过渡的漂移通量参数。从目前的实验数据与迄今公开的经验模型之间的比较以及相关性中观察到了相当好的一致性。液体和气体的表面速度都对这些机理也有重要影响。确定了从塞流到团状流过渡的漂移通量参数。从目前的实验数据与迄今公开的经验模型之间的比较以及相关性中观察到了相当好的一致性。液体和气体的表面速度都对这些机理也有重要影响。确定了从塞流到团状流过渡的漂移通量参数。从目前的实验数据与迄今公开的经验模型之间的比较以及相关性中观察到了相当好的一致性。