Vibrations of a vertical 90° pipe bend under two-phase flow conditions

IF 3.5 Q1 ENGINEERING, MULTIDISCIPLINARY
Shah Danial Shah Reza, M. Rasani
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引用次数: 0

Abstract

PurposeA simulation framework that includes a finite element analysis (FEA) and computational fluid dynamics (CFD) model is generated to study the effect of unstable two-phase flow-induced vibrations at a vertical 90° pipe bend. The corresponding fluid-structure interaction (FSI) of an unstable flow may pose danger to the piping structure. This paper intends to discuss this interaction.Design/methodology/approachFour cases of flows under the slug flow and churn flow regimes were investigated. The flow regimes vary in superficial gas velocities with velocities from 0.978 m/s to 9.04 m/s, while the superficial liquid velocity is kept constant at 0.61 m/s. The pipe model consists of an internal diameter of 0.0525 m, a bend radius of 0.0762 m, and a stainless-steel pipe structure.FindingsResults show that the average unstable void fractions increase with the superficial gas velocities, but the peak frequencies were constant at 13 Hz for three of the cases. The total displacement and von Mises stress increase with a declining rate in each subsequent case, while the RMS of von Mises stress begins to stall at superficial gas velocities between 5 m/s and 9.04 m/s. The peak frequencies of von Mises stress decrease in each subsequent case.Originality/valueThe proposed model can be used to investigate the FSI effect of unstable void fractions at pipe bends and could assist in the development of piping systems in which the use of piping elements arranged close together are unavoidable.
两相流条件下垂直90°弯管的振动
目的生成一个包括有限元分析(FEA)和计算流体动力学(CFD)模型的模拟框架,以研究垂直90°弯管处不稳定两相流引起的振动的影响。不稳定流动的相应流体-结构相互作用(FSI)可能对管道结构构成危险。本文旨在探讨这种互动关系。设计/方法/方法研究了段塞流和搅拌流状态下的四种流动情况。流动状态的表观气体速度在0.978 m/s至9.04 m/s之间变化,而表观液体速度保持恒定在0.61 m/s。管道模型由内径0.0525 m、弯曲半径0.0762 m和不锈钢管道结构组成。结果表明,平均不稳定空隙率随着表观气体速度的增加而增加,但其中三种情况的峰值频率恒定在13Hz。在随后的每种情况下,总位移和von Mises应力都会以下降的速度增加,而von Misers应力的RMS在5 m/s和9.04 m/s之间的表观气体速度下开始失速。在随后的每个情况下,von Mises应力的峰值频率都会降低。独创性/价值所提出的模型可用于研究弯管处不稳定空隙率的FSI效应,并有助于开发不可避免地使用紧密排列的管道元件的管道系统。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
International Journal of Structural Integrity
International Journal of Structural Integrity ENGINEERING, MULTIDISCIPLINARY-
CiteScore
5.40
自引率
14.80%
发文量
42
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