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RESEARCH PAPERS

Vibration of Tube Bundles in Two-Phase Cross-Flow: Part 2—Fluid-Elastic Instability

[+] Author and Article Information
M. J. Pettigrew, J. H. Tromp

Chalk River Nuclear Laboratories, Atomic Energy of Canada Limited, Chalk River, Ontario, Canada

C. E. Taylor

University of Toronto, Toronto, Ontario, Canada

B. S. Kim

Kaeri, Korea

J. Pressure Vessel Technol 111(4), 478-487 (Nov 01, 1989) (10 pages) doi:10.1115/1.3265706 History: Received August 08, 1988; Revised February 22, 1989; Online November 05, 2009

Abstract

An extensive experimental program was carried out to study the vibration behavior of tube bundles subjected to two-phase cross-flow. Fluid-elastic instability is discussed in Part 2 of this series of three papers. Four tube bundle configurations were subjected to increasing flow up to the onset of fluid-elastic instability. The tests were done on bundles with all-flexible tubes and on bundles with one flexible tube surrounded by rigid tubes. Fluid-elastic instabilities have been observed for all tube bundles and all flow conditions. The critical flow velocity for fluid-elastic instability is significantly lower for the all-flexible tube bundles. The fluid-elastic instability behavior is different for intermittent flows than for continuous flow regimes such as bubbly or froth flows. For continuous flows, the observed instabilities satisfy the relationship V /fd = K (2πζm /ρd 2 )0.5 in which the minimum instability factor K was found to be around 4 for bundles of p /d = 1.47 and significantly less for p /d = 1.32. Design guidelines are recommended to avoid fluid-elastic instabilities in two-phase cross-flows.

Copyright © 1989 by ASME
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