Abstract
In this study, the fluctuating force induced by a vertical annular two-phase flow through a pipe turning element is investigated. An experiment was conducted to obtain datasets for an annular two-phase flow regime, including dynamic force signals, outer wall acceleration, pressure fluctuations, and void fraction. To develop a model for predicting the peak fluctuating force magnitude and frequency at a 90-degree turning element, a collisional force model was formulated based on the disturbance wave of annular flow. This model was derived using a local instantaneous formulation and surface wave analysis. Model assessment revealed that momentum fluctuations significantly contribute to force fluctuations in annular two-phase flow. Additionally, collisional effects arising from interactions between the inner wall surface and disturbance waves were found to play a crucial role in force fluctuations. Force spectrum analysis demonstrated that the proposed model can predict force fluctuations and dominant frequencies induced by annular flow with satisfactory accuracy. The analytical approach to identify fluctuating force behaviors in annular two-phase flow regime presented in this work provides valuable insights for analyzing flow-induced vibration phenomena in various industrial applications. © 2025 Author(s).
| Original language | English |
|---|---|
| Article number | 042121 |
| Journal | Physics of Fluids |
| Volume | 37 |
| Issue number | 4 |
| Online published | 17 Apr 2025 |
| DOIs | |
| Publication status | Published - Apr 2025 |
Funding
Part of this work was supported by JSPS KAKENHI Grant No. 19H02638. One of the authors (T. Hibiki) would like to express his sincere appreciation to the Hong Kong SAR Government for supporting his research under the Global STEM Professorship and to the Hong Kong Jockey Club for supporting his research under the JC STEM Lab of Innovative Thermo-Fluid Science.
Publisher's Copyright Statement
- COPYRIGHT TERMS OF DEPOSITED FINAL PUBLISHED VERSION FILE: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Shuichiro Miwa, Takashi Hibiki; Flow-induced vibration of separated two-phase flow at flow-turning element. Physics of Fluids 1 April 2025; 37 (4): 042121 and may be found at https://doi.org/10.1063/5.0261068.