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Streamwise Fluidelastic Instability in Parallel Triangular Tube Arrays

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Title: Streamwise Fluidelastic Instability in Parallel Triangular Tube Arrays
Author: Pitfield, Graham
Department: School of Engineering
Program: Engineering
Advisor: Marwan, Hassan
Abstract: Fluidelastic instability is a major contributor to the failures of nuclear steam generators. This work aims to enhance the current understanding of the excitation mechanism with special attention paid to the streamwise fluidelastic instability. A two-phase flow loop was designed and built to facilitate the study of flow-induced vibrations within tube bundles in support of the nuclear industry. This thesis reports on the commissioning of the flow loop, as well as preliminary single-phase results important to validating results from the loop. A study of fluidelastic instability was conducted within a parallel triangular tube array with a pitch-to-diameter ratio of 1.48 subjected to single-phase liquid cross flow. The critical velocity of fluidelastic instability, as well as the stabilizing effect of AVBs on both the transverse and streamwise tube motion, were in good agreement with other data in the literature.
Date: 2021-05
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