Flow restricting orifices are important components for flow and pressure control in the oil, gas, and power generation industries. In many situations, the piping systems are operating under two-phase flow conditions. These orifices affect the redistribution of the two phases and induce vibrations in the piping structures. These vibrations often occur during a slug flow pattern and can severely affect the integrity of a structure; therefore, in the present work, both the vibrations of the piping structure and the characteristics of the two-phase flow dynamics are experimentally investigated in the presence of an orifice. In this study, an air–water​ two-phase flow mixture was utilized at different superficial velocities ranging from 0.12 m/s to 1.7 m/s for air and 0.46 m/s to 1.3 m/s for water. Synchronized flow visualization images, along with local void fraction and vibration measurements, were used to evaluate the response of the structure as the slug flow passed through the orifices. Detailed instantaneous local void fraction measurements were carried out to understand the underlying physics of the phenomenon and their effect on the vibration response of the structure. The results showed that not all slug flow cases excited the piping at the slug frequency. The amplitude of vibration around the slug frequency was found to increase as the superficial velocity of the gas phase increased.

限流孔是石油，天然气和发电行业中流量和压力控制的重要组成部分。在许多情况下，管道系统都在两相流条件下运行。这些孔口会影响两相的重新分布，并引起管道结构的振动。这些振动通常在团状流型期间发生，并可能严重影响结构的完整性。因此，在目前的工作中，在有孔的情况下，对管道结构的振动和两相流动力学特性进行了实验研究。在这项研究中，使用了空气-水两相流混合物，其空速从0.12 m / s到1.7 m / s，空气从0.46 m / s到1.3 m / s。同步流可视化图像，连同局部空隙率和振动测量结果一起，用于评估当团状流通过孔时结构的响应。进行了详细的瞬时局部空隙率测量，以了解现象的潜在物理原理及其对结构振动响应的影响。结果表明，并非所有的团状流案例都以团状频率激发管道。人们发现，随着气相的表观速度的增加，在弹头频率附近的振动幅度会增加。进行了详细的瞬时局部空隙率测量，以了解现象的潜在物理原理及其对结构振动响应的影响。结果表明，并非所有的团状流案例都以团状频率激发管道。人们发现，随着气相的表观速度的增加，在弹头频率附近的振动幅度会增加。进行了详细的瞬时局部空隙率测量，以了解现象的潜在物理原理及其对结构振动响应的影响。结果表明，并非所有的团状流案例都以团状频率激发管道。人们发现，随着气相的表观速度的增加，在弹头频率附近的振动幅度会增加。