Conference Proceedings Paper
Numerical Investigation of Flow-Induced Vibration and Fretting Wear Potential of Multi-Span U-Tubes with Clearance Supports
NURETH-14 - 2011 September 25-30
Marwan Hassan (University of New Brunswick)
Atef Mohany (University of New Brunswick)
In this paper, a numerical model is developed to predict the non-linear dynamic response of a
steam generator mutli-span U-tubes with Anti-Vibration Bar (AVB) supports and the associated
due to fluid excitations. Both the crossflow turbulence and fluidelastic instability
forces are considered in the model. The finite element method is utilized to model the vibrations
and impact dynamics.
The tube bundle geometry is similar to the geometry used in CANDU®
Eight sets of flat bar supports are considered. Moreover, the effect of
clearances between the tubes and their supports, and axial offset between the supports are
investigated. The results are presented and comparisons are made for the parameters influencing
the fretting-wear damage such as contact ratio, impact forces and normal work rate. It is clear
that the tubes in loose flat-bar supports have complex dynamics due to the possible combinations
, tube-to-support clearance, offset, and misalignment. However, the results of the
numerical simulation along with the developed model provide new insight into the flow-induced
vibration mechanism and fretting wear of multi-span U-tubes that can be
incorporated in future
design guidelines of steam generators and large heat exchangers.
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