抄録
In this paper, presented is an experimental study of thermal flow-induced vibration in a looped heat pipe. Pressure and temperature variation inside the tubes was measured to investigate the oscillation mechanism. It was heated at the bottom to control temperature by circulator, while was cooled at the top to keep temperature constant. Two kinds of oscillation are observed; i. e. vertical oscillation of liquid column and the rapid vibration over adjacent turns. As a result of measurement, temperature difference between adjacent adiabatic tubes is found to be excited qusi-periodically, just when the pressure difference abruptly becomes large. In contrast, temperature in heat section was observed to decrease due to the movement of liquid column from adiabatic section. Accordingly, boiling liquid could follow the increase in the pressure, which is thought to cause the vibration of over adjacent turns.
