Abstract
The tube bank is used in a boiler, a heat exchanger and a steam generator. These tubes sometimes vibrate violently and come to the fatigue failure due to the flow induced vibrations which are caused by the cross flow. This phenomenon is that the large vibration arises at the critical velocity and it is called fluid elastic instability. However the influence of tube arrays on fluid elastic instability has not been clarified yet. In this paper, the influence of tube arrays on fluid elastic instability is examined by experiments. As a result, it is clarified that the tube vibrations become large as T/D increases and LD decreases, and the tube vibrations strongly depend on the dynamic characteristics of tubes their selves such as natural frequencies and damping.
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