Fluid Damping and Fluid Stiffness of a Tube Row in Crossflow

Motion-dependent fluid forces acting on a tube array were measured as a function of excitation frequency, excitation amplitude, and flow velocity. Fluid-damping and fluid-stiffness coefficients were obtained from measured motion-dependent fluid forces as a function of reduced flow velocity and excit...

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Bibliographic Details
Published in:Journal of pressure vessel technology 1994-11, Vol.116 (4), p.370-383
Main Authors: Chen, S. S, Zhu, S, Jendrzejczyk, J. A
Format: Article
Language:English
Subjects:
Applied sciences
Damping
Describing functions
Devices using thermal energy
Differential equations
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Force measurement
Heat exchangers (included heat transformers, condensers, cooling towers)
Pipe flow
Stiffness
System stability
Tubes (components)
Unsteady flow
Velocity
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Summary:Motion-dependent fluid forces acting on a tube array were measured as a function of excitation frequency, excitation amplitude, and flow velocity. Fluid-damping and fluid-stiffness coefficients were obtained from measured motion-dependent fluid forces as a function of reduced flow velocity and excitation amplitude. The water channel and test setup provide a sound facility for obtaining key coefficients for fluidelastic instability of tube arrays in crossflow. Once the motion-dependent fluid-force coefficients have been measured, a reliable design guideline, based on the unsteady flow theory, can be developed for fluidelastic instability of tube arrays in crossflow.
ISSN:0094-9930
1528-8978
DOI:10.1115/1.2929604