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research-article

Pitch and mass Ratio effects on transverse and streamwise fluidelastic instability in parallel triAngular tube arrays

[+] Author and Article Information
Marwan A. Hassan

School of Engineering, University of Guelph, ON, Canada
mahassan@uoguelph.ca

David S. Weaver

Dept. of Mechanical Engineering, McMaster University, ON, Canada
weaverds@mcmaster.ca

1Corresponding author.

ASME doi:10.1115/1.4037717 History: Received February 08, 2017; Revised August 14, 2017

Abstract

The simple tube and channel theoretical model for fluidelastic instability in tube arrays, as developed by Hassan and Weaver, has been used to study the effects of pitch ratio and mass ratio on the critical velocity of parallel triangular tube arrays. Simulations were carried out considering fluidelastic forces in the lift and drag directions independently and acting together for cases of a single flexible tube in a rigid array and a fully flexible kernel of 7 tubes. No new empirical data were required using this model. The direction of fluidelastic instability as well as the relative importance of fluid coupling of tubes were studied, including how these are affected by tube pitch ratio and mass ratio. The simulation predictions agree reasonably well with available experimental data. It was found that parallel triangular tube arrays are more vulnerable to streamwise fluidelastic instability when the pitch ratio is small and the mass-damping parameter is large.

Copyright (c) 2017 by ASME
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