Experimental Measurement of Large-Amplitude Intermittent Vibrations of an Inclined Bendable Riser Transporting Unsteady Multiphase Flows
نویسندگان
چکیده
Marine risers transporting unsteady multiphase flows may experience internal flow-induced vibrations depending on several flow-structure parameters. This study presents an experimental investigation of large-amplitude intermittent inclined bendable riser air-water flow that exhibits slug pattern. The has initial catenary profile with a length over diameter about 320. By using non-intrusive measurement high-speed motion capture camera, new insights into the dynamic features and flow-riser interaction phenomena are presented discussed in case varying gas-to-liquid rate ratio (RGL). Pressure signals also recorded at inlet outlet, measuring pressure fluctuation caused by hydrostatic change, momentum frictional forces. For given liquid or superficial velocity, experiences modified mean drift equilibrium configuration greater vibration amplitude when increasing RGL gas velocity. most critical spatially maximum than six diameters pipe. Experimental results space-time responses frequencies analysed relation to associated including unit length, translational frequency fluctuations. Owing coupled interaction, slugs elongated bubbles vary temporally. entails highly modulated frequencies, intermittently switching multimodal response, especially is two. amplified bending stresses reported, highlighting hydrodynamic effect flow. characteristic flexible dynamics evaluated compared those predicted empirical correlations literature based stationary, straight rigid pipes. Overall, observations data useful for numerical model development comparison towards practical analysis design curved/sagged flows.
منابع مشابه
Unsteady granular flows down an inclined plane.
The continuum description of granular flows is still a challenge despite their importance in many geophysical and industrial applications. We extend previous works, which have explored steady flow properties, by focusing on unsteady flows accelerating or decelerating down an inclined plane in the simple shear configuration. We solve the flow kinematics analytically, including predictions of evo...
متن کاملThe Measurement of Volume Fraction and Velocity Profiles in Vertical and Inclined Multiphase Flows
The nature of solids-liquid flows often results in non-uniform profiles of solids volume fraction and axial solids velocity across the flow cross-section. In order to measure the solids volumetric flow rate in these situations it is necessary to measure the profiles of the local solids volume fraction and axial solids velocity and to obtain mean values of the solids volume fraction, solids axia...
متن کاملLarge Amplitude Vibrations in the HFClF Complex
Os movimentos de grande amplitude no complexo HF...ClF foram estudados teoricamente. Na solução das equações dinâmicas foi utilizada uma superfície de energia potencial ab initio calculada a nível MP2/DZ+(2d1f/2p1d)//HF/DZP, incluindo a correção para o erro de superposição do conjunto de bases (BSSE). A freqüência para o estiramento da ligação de van der Waals e a freqüência e a intensidade da ...
متن کاملExperimental study of two and three phase flows in large diameter inclined pipes
Steady-state and transient experiments of water–gas, oil–water and oil–water–gas multiphase flows were conducted on a transparent 11 m long, 15 cm diameter, inclinable pipe using kerosene, tap water and nitrogen. The pipe inclination was varied from 0 (vertical) to 92 and the flow rates of each phase were varied over wide ranges. Fast-acting valves enabled the trapping of the fluid flowing in t...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Applied Ocean Research
سال: 2021
ISSN: ['0141-1187', '1879-1549']
DOI: https://doi.org/10.1016/j.apor.2021.102731