Research Papers

Multimode Fluid Elastic Instability of Heat Exchanger Tubes

[+] Author and Article Information
R. D. Blevins

San Diego, CA 92103

Contributed by the Design Engineering Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received August 31, 2012; final manuscript received September 12, 2013; published online November 19, 2013. Assoc. Editor: Walter Lacarbonara.

J. Vib. Acoust 136(1), 011015 (Nov 19, 2013) (6 pages) Paper No: VIB-12-1246; doi: 10.1115/1.4025604 History: Received August 31, 2012; Revised September 12, 2013

Multimode fluid elastic instability analysis is made of heat exchanger tubes in cross flow. The stability analysis predicts that the flow velocity for onset of tube instability in nonuniform flow is lowered by participation of multiple tube modes with similar natural frequencies.

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Fig. 1

Three cases of multiple span heat exchanger tubes with nonuniform flow

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Fig. 2

Elastically supported tubes in cross flow [2]

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Fig. 3

Mode shapes of an eight span beam with clamped ends

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Fig. 4

Superposition of modes 6 and 7 efficiently responds to flow velocity over the first span




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