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<p>Slug-flow-induced vibration in curved piping systems remains a persistent integrity challenge because the response is governed by unsteady two-phase flow, bend geometry, and structural flexibility. In elbows, return bends, and flexible risers, slugging not only generates fluctuating loads but also modifies load redistribution and structural response. This review examines the literature with emphasis on excitation mechanisms, governing parameters, geometric effects, thermal limitations, and modeling approaches. The reviewed evidence shows that the response is shaped mainly by transient momentum exchange, curvature-induced inertial loading, and pressure oscillations. Superficial velocity and void fraction govern slug frequency, transported mass, and forcing periodicity. Curvature effects become increasingly important as bend ratio decreases, with R/D ≤ 3 representing a practical threshold for spatially resolved assessment, while short-radius elbows with R/D = 1.5 require particular attention. A clear gap remains because most studies still rely on isothermal assumptions. Quantitative estimates show that heating a representative water/carbon-steel system from 25 to 100&#xa0;°C reduces liquid viscosity by approximately 68.4% and surface tension by 18.2%, while decreasing Young’s modulus by about 2.0%. These changes can influence slug forcing and structural resonance. The review therefore argues for thermally coupled assessment and outlines a conceptual multi-tier T-FSI framework for screening, local analysis, and high-temperature applications. Its originality lies in integrating hydrodynamic excitation, bend-induced force redistribution, structural flexibility, and thermal-property variation into a unified assessment framework for curved two-phase piping systems.</p>

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Slug-Flow-Induced Vibration in Curved Piping Systems: Mechanisms, Modeling, and Thermal Coupling

  • 期刊论文

  • 发表日期：

    2026年6月19日

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  • Mahmood Hasan Oudah,
  • Kifah H. Hilal,
  • Zena Khalefa Kadhim

摘要

Slug-flow-induced vibration in curved piping systems remains a persistent integrity challenge because the response is governed by unsteady two-phase flow, bend geometry, and structural flexibility. In elbows, return bends, and flexible risers, slugging not only generates fluctuating loads but also modifies load redistribution and structural response. This review examines the literature with emphasis on excitation mechanisms, governing parameters, geometric effects, thermal limitations, and modeling approaches. The reviewed evidence shows that the response is shaped mainly by transient momentum exchange, curvature-induced inertial loading, and pressure oscillations. Superficial velocity and void fraction govern slug frequency, transported mass, and forcing periodicity. Curvature effects become increasingly important as bend ratio decreases, with R/D ≤ 3 representing a practical threshold for spatially resolved assessment, while short-radius elbows with R/D = 1.5 require particular attention. A clear gap remains because most studies still rely on isothermal assumptions. Quantitative estimates show that heating a representative water/carbon-steel system from 25 to 100 °C reduces liquid viscosity by approximately 68.4% and surface tension by 18.2%, while decreasing Young’s modulus by about 2.0%. These changes can influence slug forcing and structural resonance. The review therefore argues for thermally coupled assessment and outlines a conceptual multi-tier T-FSI framework for screening, local analysis, and high-temperature applications. Its originality lies in integrating hydrodynamic excitation, bend-induced force redistribution, structural flexibility, and thermal-property variation into a unified assessment framework for curved two-phase piping systems.