抄録
Shell and Tube Heat exchangers are widely used in thermal and nuclear power industry for heat exchange between different streams. Heat exchanger tubes can be damaged when undergoing excessive flow induced vibration. Good design requires better understanding of vibration excitation and fluid elastic instability and other parameters like damping. To incorporate these phenomena into flow induced vibration analysis mechanisms such as vortex shedding, turbulent of a heat exchanger, vibration damping must be understood. Radiation hazard during nuclear plant shutdowns forces to continue study on vibration damping. In the past, several experiments have targeted damping related to FIV in heat exchanger tubes but the effect of temperature on vibration damping has not been fully verified. The non-stationary fluid-dynamic forces cause vibrations of heat exchanger tubes. The effect of vibrating instability of a single tube is modeled using the power of computational methods. Results for the natural frequencies of a tube are presented with theoretical comparisons, showing the accurate, efficient estimation of natural frequency and damping and their variation with temperature. It is expected that present attempt will help in establishing improved design guideline with respect to damping in tube bundles.
