Research Article

Fluid-Elastic Instability Tests on Parallel Triangular Tube Bundles with Different Mass Ratio Values under Increasing and Decreasing Flow Velocities

Figure 5

Time histories of the free vibrations of the monitored tubes in air. (a) Aluminum tube in the in-line direction, (b) aluminum tube in the transverse direction, (c) stainless steel tube in the in-line direction, and (d) stainless steel tube in the transverse direction.
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(b)
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