Research Article
Fluid-Elastic Instability Tests on Parallel Triangular Tube Bundles with Different Mass Ratio Values under Increasing and Decreasing Flow Velocities
Table 1
Monitored tubes data without flow.
| | | Aluminum tube | Stainless steel tube |
| | Natural frequency in air in the in-line direction, (Hz) | 10.547 | 9.668 | | Natural frequency in air in the transverse direction, (Hz) | 10.547 | 9.668 | | Damping ratio in air in the in-line direction, | 0.829% | 0.813% | | Damping ratio in air in the transverse direction, | 0.845% | 0.821% | | Natural frequency in still water in the in-line direction, (Hz) | 8.105 | 8.301 | | Natural frequency in still water in the transverse direction, (Hz) | 8.105 | 8.301 | | Damping ratio in still water in the in-line direction, | 5.121% | 3.734% | | Damping ratio in still water in the transverse direction, | 5.162% | 3.816% | | Structural mass (including acceleration transducers inside), (kg) | 0.02213 | 0.04619 | | Oscillating mass of the system, (kg) | 0.03680 | 0.06087 | | Mass per unit length of the tube, (kg/m) | 0.2831 | 0.4682 | | Mass ratio | 2.508 | 4.147 |
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