Two-phase cross-flow exists in many shell-and-tube heat exchangers. Flow-induced vibration excitation forces can cause tube motion that will result in long-term fretting wear or fatigue. Studies on the subject, providing results on turbulence-induced displacement, fluid-elastic instabilities, and flow patterns have already been performed. It has been shown that the flow configuration plays an important role in the vibrations excitation mechanism. Previous studies showed the existence of unexpected quasi-periodic forces acting on a tube bundle subjected to two-phase cross-flow. The present work aims to understand the physical origin of these forces. A simple numerical model was developed to simulate two-phase cross-flow acting on a tube bundle. This model considers a continuous liquid potential flow across a tube bundle, with virtual bubbles being introduced in the flow. Three kinds of forces act on the bubbles: buoyancy forces, drag forces, and impact forces. These forces take place between two bubbles, or between a bubble and a cylinder. Two bubbles may coalesce if they hit each other, and conversely a bubble may split into two bubbles if the shear flow is strong enough. These local considerations on bubbles have global consequences on the flow configuration. Preliminary results show similarities between the numerical flow configuration and the experiments.
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ASME 2011 Pressure Vessels and Piping Conference
July 17–21, 2011
Baltimore, Maryland, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-4454-0
PROCEEDINGS PAPER
Development of a Numerical Model to Represent Two-Phase Flow Configurations in a Tube Bundle Available to Purchase
Hubert Senez,
Hubert Senez
E´cole Polytechnique, Montre´al, QC, Canada
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Ste´phane E´tienne
Ste´phane E´tienne
E´cole Polytechnique, Montre´al, QC, Canada
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Hubert Senez
E´cole Polytechnique, Montre´al, QC, Canada
Ste´phane E´tienne
E´cole Polytechnique, Montre´al, QC, Canada
Paper No:
PVP2011-57257, pp. 195-209; 15 pages
Published Online:
May 21, 2012
Citation
Senez, H, & E´tienne, S. "Development of a Numerical Model to Represent Two-Phase Flow Configurations in a Tube Bundle." Proceedings of the ASME 2011 Pressure Vessels and Piping Conference. Volume 4: Fluid-Structure Interaction. Baltimore, Maryland, USA. July 17–21, 2011. pp. 195-209. ASME. https://doi.org/10.1115/PVP2011-57257
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