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RESEARCH PAPERS: Fluid-Elastic Vibration Phenomena

The Effect of Approach Flow Direction on the Flow-Induced Vibrations of a Triangular Tube Array

[+] Author and Article Information
H. C. Yeung

BHRA Fluid Engineering, Cranfield, Bedford, U.K.

D. S. Weaver

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

J. Vib., Acoust., Stress, and Reliab 105(1), 76-81 (Jan 01, 1983) (6 pages) doi:10.1115/1.3269070 History: Received June 09, 1981; Online November 23, 2009

Abstract

Water tunnel experiments were conducted on an equilateral triangular array of tubes with a pitch ratio of 1.5. Eight tests were run with different array orientations so that the effects of incident flow direction on crossflow induced vibrations could be studied. Small amplitude vorticity response was observed for all orientations except the parallel triangular array. A Strouhal number of 0.57 based on pitch velocity and independent of incident flow directions was found. The fluidelastic threshold for the normal triangular array was found to be about twice that of the parallel triangular array. However, the stability threshold for the normal triangular array was found to be quite sensitive to incident flow direction suggesting that advantage of this higher threshold should not be taken in the design of heat exchangers.

Copyright © 1983 by ASME
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