Collapse of a Cavitation Bubble in Deuterated Tetradecane

Abstract: Strong compression of the fluid in a collapsing cavitation bubble in deuterated tetradecane is studied at the liquid temperature $$T_{0}=663$$ K and pressure $$p_{0}$$ in the range from 13 to 100 bar. The bubble collapse is assumed spherical. At the beginning of collapse, the bubble is filled with tetradecane vapor in the saturation state at the temperature $$T_{0}$$ , the initial bubble radius is 500 $$\mu$$ m. To describe the dynamics of the vapor in the bubble and the surrounding liquid, a hydrodynamic model is used, which takes into account the non-stationary thermal conduction of both fluids and the nonequilibrium evaporation-condensation at the interface. Wide-range equations of state are applied. It is shown that the cavitation bubble collapse in deuterated tetradecane at $$p_{0}=50$$ bar and that in deuterated acetone at $$T_{0}=273$$ K and $$p_{0}=15$$ bar are in good agreement in terms of the number of neutrons arising in the bubbles. The neutrons are produced both when a shock wave arising in the bubble at the final stage of its collapse converges to the bubble center and when this shock wave diverges after its reflection from the center. The most intense production is observed at some distance from the bubble center (by about 10 nm). It is found that the fluid compression degrees achieved in the collapsing cavitation bubbles in deuterated and non-deuterated tetradecane are comparable.