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Influence of the mass flow rate and void fraction on the vibration of a horizontal U-bend subjected to an upwards flowing air/water-mixture

Laurent De Moerloose (UGent) , Jan Vierendeels (UGent) and Joris Degroote (UGent)
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Abstract
U-bends are a common geometry in heat exchangers. In this paper, a U-bend is considered with horizontal straight pipes subjected to an initially stratified water/air flow which moves upwards against gravity. The flow is analyzed with an Unsteady Reynolds-Averaged Navier- Stokes Volume-Of-Fluid approach. For low mass flow rates, large gas bubbles are naturally formed at the entrance of the bend. The transient force on the tube allows to determine precisely the moments of bubble initiation and thus to quantify the bubble frequency. Firstly, the tube is assumed to be rigid and the dependence of force oscillation on the inlet conditions is investigated. Secondly, a Fluid-Structure Interaction calculation is applied in order to determine the vibration amplitude of the tube.
Keywords
computational fluid dynamics, fluid-structure interaction, multiphase flow, U-bend

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MLA
De Moerloose, Laurent, Jan Vierendeels, and Joris Degroote. “Influence of the Mass Flow Rate and Void Fraction on the Vibration of a Horizontal U-bend Subjected to an Upwards Flowing Air/water-mixture.” Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise. 2018. Print.
APA
De Moerloose, L., Vierendeels, J., & Degroote, J. (2018). Influence of the mass flow rate and void fraction on the vibration of a horizontal U-bend subjected to an upwards flowing air/water-mixture. Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise. Presented at the 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise.
Chicago author-date
De Moerloose, Laurent, Jan Vierendeels, and Joris Degroote. 2018. “Influence of the Mass Flow Rate and Void Fraction on the Vibration of a Horizontal U-bend Subjected to an Upwards Flowing Air/water-mixture.” In Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise.
Chicago author-date (all authors)
De Moerloose, Laurent, Jan Vierendeels, and Joris Degroote. 2018. “Influence of the Mass Flow Rate and Void Fraction on the Vibration of a Horizontal U-bend Subjected to an Upwards Flowing Air/water-mixture.” In Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise.
Vancouver
1.
De Moerloose L, Vierendeels J, Degroote J. Influence of the mass flow rate and void fraction on the vibration of a horizontal U-bend subjected to an upwards flowing air/water-mixture. Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise. 2018.
IEEE
[1]
L. De Moerloose, J. Vierendeels, and J. Degroote, “Influence of the mass flow rate and void fraction on the vibration of a horizontal U-bend subjected to an upwards flowing air/water-mixture,” in Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise, Toronto, ON, Canada, 2018.
@inproceedings{8579697,
  abstract     = {U-bends are a common geometry in heat exchangers. In this paper, a U-bend is considered with horizontal straight pipes subjected to an initially stratified water/air flow which moves upwards against gravity. The flow is analyzed with an Unsteady Reynolds-Averaged Navier- Stokes Volume-Of-Fluid approach. For low mass flow rates, large gas bubbles are naturally formed at the entrance of the bend. The transient force on the tube allows to determine precisely the moments of bubble initiation and thus to quantify the bubble frequency. Firstly, the tube is assumed to be rigid and the dependence of force oscillation on the inlet conditions is investigated. Secondly, a Fluid-Structure Interaction calculation is applied in order to determine the vibration amplitude of the tube.},
  articleno    = {134},
  author       = {De Moerloose, Laurent and Vierendeels, Jan and Degroote, Joris},
  booktitle    = {Proceedings of 9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise},
  keywords     = {computational fluid dynamics,fluid-structure interaction,multiphase flow,U-bend},
  language     = {eng},
  location     = {Toronto, ON, Canada},
  pages        = {6},
  title        = {Influence of the mass flow rate and void fraction on the vibration of a horizontal U-bend subjected to an upwards flowing air/water-mixture},
  url          = {https://fiv2018.com/ocs/index.php/fiv2018/fivcan/paper/view/134},
  year         = {2018},
}