Fluidelastic Vibration of Heat Exchanger Tube Arrays

[+] Author and Article Information
H. J. Connors

Westinghouse Research Laboratories, Pittsburgh, Pa.

J. Mech. Des 100(2), 347-353 (Apr 01, 1978) (7 pages) doi:10.1115/1.3453921 History: Received June 24, 1977; Online October 21, 2010


A basic fluidelastic excitation mechanism, of a type reported in an earlier paper, causes large whirling vibrations of tubes in model arrays when the flow velocity exceeds a critical value. The critical velocity is U = βfn DmoδnoD2 where β, the threshold instability constant is a function of the tube pattern and spacing. Threshold instability constants are given that were obtained from wind tunnel and water tunnel tests on multirow tube arrays in uniform cross flow. Test results are discussed that demonstrate the effects of spanwise variations in flow velocity on fluidelastic whirling for both straight tubes and U-tubes. Design methods are provided for predicting the onset of fluidelastic whirling of heat exchanger tubes on multiple supports when spanwise variations in the cross flow exist.

Copyright © 1978 by ASME
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