Session: FSI-02-01 Tube Arrays - 1

Paper Number: 105825

105825 - Analysis of Fluid-Elastic Instability Models for Tube Banks With Square Arrangement in Cross-Flow 

Fluid elastic instability is a problem in industrial applications observed in heat exchangers and tube clusters in cross-flow. It is characterized by a sudden increase in vibration amplitude and can damage equipment in hours. In recent decades, models based on the mass-damping parameter have been developed to predict the critical reduced velocity. The mass-damping parameter englobes the mass ratio, the damping ratio, and empiric relations to account for the additional variables, such as - space ratio, and turbulence intensity, among others. The models to obtain the critical reduced velocity do not present a good agreement in all the cases and additional parameters could be considered. The present study aims to summarize the existing models to determine the critical reduced velocity in tube banks with a pitch ratio of 1.26 in a square arrangement, compare them with experimental data and propose adjustments considering the position of the cylinder free to vibrate. The methodology is divided into two main steps. The first step is to carry out a bibliographic analysis of the models commonly used in equipment design, identifying the most applied models and categorizing the main variables used. The second step is to conduct an analytical procedure based on experimental results for a range of mass-damping parameters, with the cylinder free to vibrate in different positions inside a tube bank with square arrangement to adjust the models. Preliminary results showed that the available models are conservative in the determination of the critical reduced velocity and, in general, were obtained using the quasi-static approach.

 

Presenting Author: Sergio Viçosa Möller Universidade Federal do Rio Grande do Sul

Presenting Author Biography: Full Professor of the Mechanical Engineering Department of the Federal University of Rio Grande do Sul, in Porto Alegre, Brazil
Mechanical Engineer, Federal University of Rio Grande do Sul, 1976.
Master of Sciences, Federal University of Rio de Janeiro, 1979.
Doktor-Ingenieur, University of Karlsruhe, Germany, 1988.
From 1977 to 1989 worked at the Brazilian Nuclear Energy Commission, with several delegations to the Research Centers of Jülich and Karlsruhe, Germany.
Since 1990, coordinator of the Fluid Mechanics Laboratory of the Federal University of Rio Grande do Sul.
Since 1993, member of IASMiRT, the International Association of Structural Mechanics in Reactor Technology.
Since 1993, member of ABCM, the Brazilian Society of Mechanical Sciences and Engineering.
From 2013 to 2017, President of ABCM, the Brazilian Society of Mechanical Sciences and Engineering.
From 2017, Editor of the magazine ABCM Engenharia.

Authors:

Roberta Fátima Neumeister University of São Paulo (USP)
Adriane Prisco Petry Federal University of Rio Grande do Sul UFRGS
Sergio Viçosa Möller Universidade Federal do Rio Grande do Sul