Dynamic characteristics of tube bundles with crack subjected to cross-flow and loose support

2022 ◽  
Vol 166 ◽  
pp. 108802
Author(s):  
Jiang Lai ◽  
Lingling Lu ◽  
Shihao Yang ◽  
Tiancai Tan ◽  
Lei Sun
Keyword(s):  
Dynamic Characteristics ◽  
Cross Flow ◽  
Tube Bundles ◽  
Loose Support

Turbulence-induced vibration of tube bundles subjected to cross-flow and loose support

2021 ◽  
pp. 104601
Author(s):  
Jiang Lai ◽  
Shihao Yang ◽  
Tiancai Tan ◽  
Lixia Gao ◽  
Lei Sun ◽  
...  
Keyword(s):  
Cross Flow ◽  
Tube Bundles ◽  
Loose Support

Damage identification of tube bundles with crack subjected to cross-flow and loose support

2022 ◽  
Vol 164 ◽  
pp. 108293
Author(s):  
Lingling Lu ◽  
Jiang Lai ◽  
Shihao Yang ◽  
HW Song ◽  
Lei Sun
Keyword(s):  
Damage Identification ◽  
Cross Flow ◽  
Tube Bundles ◽  
Loose Support

An Experimental Investigation of the Dynamics of a Loosely Supported Tube Array

2017 ◽  
Author(s):  
Amro Elhelaly ◽  
Marwan Hassan ◽  
Atef Mohany ◽  
Soha Moussa
Keyword(s):  
Experimental Investigation ◽  
Impact Force ◽  
Cross Flow ◽  
Open Loop ◽  
Diameter Ratio ◽  
Force Level ◽  
Steam Generators ◽  
Flow Induced Vibration ◽  
System Integrity ◽  
Tube Bundles

The integrity of tube bundles is very important especially when dealing with high-risk applications such as nuclear steam generators. A major issue to system integrity is the flow-induced vibration (FIV). FIV is manifested through several mechanisms including the most severe mechanism; fluidelastic instability (FEI). Tube vibration can be constrained by using tube supports. However, clearances between the tube and their support are required to allow for thermal expansion and for other manufacturing considerations. The clearance between tubes may allow frequent impact and friction between tube and support. This in turn may cause fatigue and wear at support and potential for catastrophic tube failure. This study aims to investigate the dynamics of loosely supported tube array subjected to cross-flow. The work is performed experimentally in an open-loop wind tunnel to address this issue. A loosely-supported single flexible tube in both triangle and square arrays subjected to cross-flow with a pitch-to-diameter ratio of 1.5 and 1.733, respectively were considered. The effect of the flow approach angle, as well as the support clearance on the tube response, are investigated. In addition, the parameters that affect tube wear such as impact force level are presented.

Development of a Numerical Model for Quasi-Periodic Forces of Two-Phase Cross Flow in Tube Bundles

2014 ◽  
Author(s):  
Sarra Zoghlami ◽  
Cédric Béguin ◽  
Stéphane Étienne
Keyword(s):  
Numerical Model ◽  
Tube Bundle ◽  
Cross Flow ◽  
Deep Understanding ◽  
Added Mass ◽  
Dispersed Phase ◽  
Two Phase ◽  
Induced Drag ◽  
Tube Bundles ◽  
Lagrange Approach

To reduce the damage caused by induced vibrations due to two-phase cross flow on tube bundles in heat exchangers, a deep understanding of the different sources of this phenomenon is required. For this purpose, a numerical model was previously developed to simulate the quasi periodic forces on the tube bundle due to two-phase cross flow. An Euler-Lagrange approach is adopted to describe the flow. The Euler approach describes the continuous phase (liquid) using potential flow. The dispersed phase is assumed to have no interaction on liquid flow. Based on visual observation, static vortices behind the tube are introduced. The Lagrange approach describes the dispersed phase (gas). The model allows bubbles to split up or to coalesce. The forces taken into account acting on the bubbles are the buoyancy, the drag and induced drag, the added mass and induced added mass and impact force (bubble-bubble and bubble-tube). Forces taken into account acting on the tubes are impact forces and induced drag and added mass forces. This model allows us to obtain quasi periodic force on tube induced by two-phase cross flow of relative good magnitude and frequency contains. The model still needs improvement to bring us closer to experimental data of force, for example by introducing a dependency between the void ratio and the intensity of the vortex and by taking into account the bubbles deformation.

A numerical study of heat and momentum transfer for flexible tube bundles in cross flow

1989 ◽  
Vol 32 (11) ◽  
pp. 2027-2036 ◽  
Author(s):  
Chang Yeon ◽  
Anthony N. Beris ◽  
Efstathios E. Michaelides
Keyword(s):  
Momentum Transfer ◽  
Numerical Study ◽  
Cross Flow ◽  
Flexible Tube ◽  
Tube Bundles ◽  
Heat And Momentum Transfer

scholarly journals Numerical simulation of oxidation processes in a cross-flow around tube bundles

2018 ◽  
Vol 59 ◽  
pp. 251-271 ◽  
Author(s):  
Alexander G. Churbanov ◽  
Oleg Iliev ◽  
Valery F. Strizhov ◽  
Petr N. Vabishchevich
Keyword(s):  
Numerical Simulation ◽  
Cross Flow ◽  
Oxidation Processes ◽  
Tube Bundles

Design guidelines for fluid-elastic instability of tube bundles subjected to two-phase cross flow

2019 ◽  
Vol 20 (8) ◽  
pp. 577-589
Author(s):  
Ning Sun ◽  
Rui-jia Cheng ◽  
Ya-nan Zhang ◽  
Bao-qing Liu ◽  
Bengt Sunden
Keyword(s):  
Cross Flow ◽  
Design Guidelines ◽  
Elastic Instability ◽  
Two Phase ◽  
Tube Bundles
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