Slug flow has drawn attention for industrial applications because it is one of the most prevalent and problematic two-phase flows due to severe pressure fluctuations. The effects of rib elements installed at the inner walls of a channel on the flow structure and pressure fluctuations are experimentally investigated with particular focus on how the rib elements alter slugging phenomena as compared with a smooth channel without ribs. Statistical analyses are conducted to elucidate the relation between pressure fluctuations and flow dynamics of slug flow in channels with ribs. For the slug flow in the ribbed channels, pressure fluctuations are alleviated, and the dominant frequency of the peak power magnitude for the pressure disappears. Two distinct mechanisms for air bubble entrainment are suggested depending on the width-to-height ratio of the rib geometry. This accounts for different levels of pressure fluctuation mitigation and the increase in flow randomness as well as pressure loss along the channel.

由于严重的压力波动，团状流是最普遍和最有问题的两相流之一，因此引起了工业应用的关注。实验研究了安装在通道内壁的肋元件对流动结构和压力波动的影响，特别关注与没有肋的光滑通道相比，肋元件如何改变段塞现象。进行统计分析以阐明压力波动与带肋通道中段塞流的流动动力学之间的关系。对于肋状通道中的段塞流，压力波动得到缓解，压力峰值功率大小的主导频率消失。根据肋条几何形状的宽高比，建议使用两种不同的气泡夹带机制。这说明了不同级别的压力波动缓解和流动随机性的增加以及沿通道的压力损失。