Abstract
This paper deals with the mechanism of damping and excitation force acting on a vibrating tube in two-phase flow. The gas phase flows faster than the liquid phase in two-phase flow. This relative velocity can cause turbulence and momentum diffusivity which induce pressure fluctuation and additional viscosity. The investigation of the relationship between tube vibration and two-phase flow showed that damping ratio and excitation force are closely related to the drift flux of the gas phase. From these results it was found that damping ratio ζ is given by ζ∝ρL(1-α)√jGL, and excitation force √Φeq is by √Φeq∝ρL(1-α)jGL, where, ρL is liquid density, α is void fraction, jGL is drift flux.
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