The fluidelastic instability behaviour of flexible cylinders subjected to internal single-phase (liquid or gas) flows is now reasonably well understood. Although many piping systems operate in two-phase flows, so far very little work has been done to study their dynamic behaviour under such flows. This paper presents the results of a series of experiments to study the fluidelastic instability behaviour of flexible tubular cylinders subjected to two-phase internal flow. Several flexible cylinders of different diameters, lengths and flexural rigidities were tested over a broad range of flow velocities and void fractions in an air-water loop to simulate two-phase flows. Well-defined fluidelastic instabilities were observed in two-phase flows. The existing theory to formulate the fluidelastic behaviour under internal flow was developed further to take into account two-phase flow. The agreement between the experimental results and the modified theory is remarkably good. However, it depends on using an appropriate model to formulate the characteristics of the two-phase flows.
Fluidelastic Instability of Flexible Tubular Cylinders Subjected to Two-Phase Internal Flow
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Monette, C, & Pettigrew, MJ. "Fluidelastic Instability of Flexible Tubular Cylinders Subjected to Two-Phase Internal Flow." Proceedings of the ASME 2003 Pressure Vessels and Piping Conference. Flow-Induced Vibration. Cleveland, Ohio, USA. July 20–24, 2003. pp. 203-212. ASME. https://doi.org/10.1115/PVP2003-2091
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