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Technology Reviews

Damping of Heat Exchanger Tubes in Liquids: Review and Design Guidelines

[+] Author and Article Information
M. J. Pettigrew

Department of Mechanical Engineering, Ecole Polytechnique, Montreal, QC H3T 1J4, Canada

R. J. Rogers

Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada

F. Axisa

11 Villa Poirier, Paris 75015, France

J. Pressure Vessel Technol 133(1), 014002 (Jan 21, 2011) (11 pages) doi:10.1115/1.4000711 History: Received September 11, 2008; Revised October 06, 2009; Published January 21, 2011; Online January 21, 2011

This paper addresses the question of damping of multispan heat exchanger tubes with liquids (mostly water) on the shell side. The different energy dissipation mechanisms that contribute to damping are investigated. The available experimental data from the literature and from our own measurements are reviewed and analyzed. Three important energy dissipation mechanisms emerge. These are viscous damping between the tube and liquid, squeeze-film damping in the clearance between the tube, and support and friction damping at the support. Viscous damping only accounts for approximately 25% of the total damping of a typical tube. Thus, about 75% of the damping energy is dissipated at the support. Squeeze-film damping appears to be the most important energy dissipation mechanism. Squeeze-film damping is related to the support width and is inversely proportional to the tube frequency. Damping is formulated in terms of tube and tube-support parameters. Semi-empirical formulations for damping of heat exchanger tubes in liquids are recommended for design purposes.

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References

Figures

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Figure 1

Types of tube motion at the support location

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Figure 2

Types of dynamic interaction between the tube and tube-support

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Figure 3

Damping data for multispan heat exchanger tubes in water

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Figure 4

Viscous damping data for a cylinder in confined (28) and unconfined liquids (all other data): comparison between theory and experiment

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Figure 5

Viscous damping of cylinders in liquids versus Stokes number

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Figure 6

Damping due to tube-supports in multispan heat exchanger tubes

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Figure 7

Heat exchanger tube with N spans and (N−1) intermediate supports

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Figure 8

Linearization of three-dimensional factor K

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Figure 9

Damping and hydrodynamic mass functions Im(H) and Re(H)(23)

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Figure 10

Squeeze-film damping of multispan heat exchanger tube in water

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Figure 11

Effect of support thickness parameter (L/lm) on damping due to tube-supports

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Figure 12

Comparison between tube-support damping parameter and experimental data for heat exchanger tube damping in water (squeeze-film model only)

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Figure 13

Type of contact between the tube and the support

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Figure 14

Comparison between the tube-support damping model (squeeze-film and friction) and the experimental data

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