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On the Dynamics and Stability of a Viscoelastic Pipe Conveying a Non-Newtonian Fluid

机译:输送非牛顿流体的粘弹性管道的动力学和稳定性

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Flow induced vibration of pipeline and riser systems are strongly dependent on internal fluid flow parameters as well as the mechanical properties of the conveyance vessel. The effect of variability of flow parameters especially at elevated temperatures can lead to instability, buckling and bursting of these systems. In this paper, the effect of high temperature fluid transmission on the vibration and stability of an offshore viscoelastic pipeline conveying a non-Newtonian fluid is investigated analytically. By idealising the viscoelastic pipeline resting on the sea bed as a viscoelastic beam that is resting on an elastic continuum, a non-linear boundary value partial differential equation governing the fluid- structure- soil interaction mechanics is formulated. In particular, formal linearization of the governing partial differential equation, under slight perturbation of the internal fluid velocity and other flow variables revealed their impact, on the natural frequency and stability of the system which can then be computed for design analysis and applications.
机译:管道和立管系统的流动引起的振动在很大程度上取决于内部流体流动参数以及运输容器的机械性能。流量参数可变性的影响,尤其是在高温下,可能导致这些系统不稳定,扭曲和爆裂。本文分析了高温流体传输对输送非牛顿流体的海上粘弹性管道的振动和稳定性的影响。通过将搁置在海床上的粘弹性管道理想化为搁置在弹性连续体上的粘弹性梁,可以制定出控制流体-结构-土壤相互作用力学的非线性边界值偏微分方程。特别是,在内部流体速度和其他流量变量受到轻微扰动的情况下,控制性偏微分方程的形式线性化显示了它们对系统固有频率和稳定性的影响,然后可以对其进行计算,以进行设计分析和应用。

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