Numerical analysis of the effects of radiation heat transfer and ionization energy loss on the cavitation Bubbleʼs dynamics

A numerical scheme for simulating the acoustic and hydrodynamic cavitation was developed. Bubble instantaneous radius was obtained using Gilmore equation which considered the compressibility of the liquid. A uniform temperature was assumed for the inside gas during the collapse. Radiation heat transfer inside the bubble and the heat conduction to the bubble was considered. The numerical code was validated with the experimental data and a good correspondence was observed. The dynamics of hydrofoil cavitation bubble were also investigated. It was concluded that the thermal radiation heat transfer rate strongly depended on the cavitation number, initial bubble radius and hydrofoil angle of attack.

► Heat transfer and ionization energy losses were analyzed in the cavitation bubble.
► Radiation of hydrodynamic bubble was approximately equal to the black body.
► Radiation heat transfer did not affect the bubble dynamic.
► Conduction decreased the bubble pressure and increased the bubble temperature.
► Ionization decreased the temperature and increased the pressure in the bubble.