Experimental Study on Fluid Elastic Instability of Concentric Circular Arrangement Heat Exchanger Tubes

Abstract

Abstract In the industrial production, there exists the phenomenon of structure vibration caused by flow, which will cause the deformation and failure of the structure and lead to the economic loss, and even cause the industrial accident and great danger. In this paper, the one mechanism of fluid-induced vibration, namely fluid elastic instability, of the concentric circle arrangement tube bundles in the sodium-sodium heat exchanger is studied experimentally. According to different central angle positions, three kinds of tubular plates are designed, which are approximately triangle arrangement, approximately square arrangement and transitional arrangement respectively. In the small-size water tunnel non-contact graphic measurement is adopted to obtain the critical flow rate Ucr when the tube bundle is unstable. The experimental results show that the flow induced vibration resistance of the transitional arrangement is better, and the critical flow velocity is about 3.78.