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RESEARCH PAPERS: Fluid-Elastic Vibration Phenomena

Flow-Induced Vibrations of Heat Exchanger U-Tubes: A Simulation to Study the Effects of Asymmetric Stiffness

[+] Author and Article Information
D. S. Weaver

Department of Mechanical Engineering, McMaster University, Hamilton, Ontario, Canada

D. Koroyannakis

Atomic Energy of Canada Ltd., Sheridan Park, Mississauga, Ontario, Canada

J. Vib., Acoust., Stress, and Reliab 105(1), 67-75 (Jan 01, 1983) (9 pages) doi:10.1115/1.3269069 History: Received June 09, 1981; Online November 23, 2009

Abstract

A water tunnel study was conducted to study the effect of asymmetric stiffness on a parallel triangular array of tubes with a pitch ratio of 1.375. The tubes were cantilevered from rectangular support rods so that the stiffness, and hence natural frequencies, were different in directions parallel and transverse to the flow. This arrangement was designed to simulate the difference in in-plane and out-of-plane natural frequencies of curved tubes. A test was conducted with symmetric stiffness for datum purposes and then eight tests were run with differences between streamwise and transverse frequencies ranging from 6.3 to 57 percent. It was found that the critical reduced velocity based on the lower frequency was increased only slightly over the symmetric case. This effect is essentially independent of the difference in frequency and the direction of the lower frequency relative to the flow.

Copyright © 1983 by ASME
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