Fluid damping and fluid stiffness of tube arrays in crossflow Page: 4 of 51
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Fluid Damping and Fluid Stiffness of
Tube Arrays in Crossflow
S. S. Chen, S. Zhu, and J. A. Jendrzejczyk
Argonne National Laboratory
9700 S. Cass Avenue
Argonne, IL 60439
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.
The components of many heat exchangers and steam generators comprise a
group of tubes submerged in crossflow. Fluid flow is a source of energy that can
induce vibration and instability. In general, the excitation forces can be divided into
two groups. When a tube array is rigid, it disturbs the flow field and the fluid forces
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Chen, S. S.; Zhu, S. & Jendrzejczyk, J. A. Fluid damping and fluid stiffness of tube arrays in crossflow, article, June 1, 1994; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc1317534/m1/4/: accessed May 22, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.