Numerical simulation of phase transition evolution of evaporative cooling medium C6F12O under inhomogeneous electric field

C ₆ F ₁₂ O, an environmentally friendly medium, is non-flammable and non-explosive with excellent insulating properties. Moreover, it is economically favourable for phase change cooling technology which offers safe and efficient heat dissipation for high-power, large-capacity electrical equipment. Despite its potential, the application of C ₆ F ₁₂ O as a cooling medium is nascent. The work employs numerical simulation to consider the mutual coupling effects of the electric-flow-thermal-phase fields, and investigates the influence of temperature and inhomogeneous electric fields on the evolution of bubble motion during the boiling process of the C ₆ F ₁₂ O medium. Typical characteristic parameters of bubble motion are obtained, and the analysis of the inherent connection between bubble release rate and motion speed is conducted to predict the formation of bubble channels. Numerical results indicate that higher temperatures and Electric Bond numbers ( Bo_E ) enhance the release frequency and velocity of C ₆ F ₁₂ O bubbles. The inhomogeneous electric field increases the stretching degree of bubble release, facilitating faster detachment. Furthermore, a warning coefficient D is proposed to characterize the generation of bubble channels, which signifies the speed and frequency of bubble motion. The D value below 7 signals potential insulation performance degradation, necessitating caution; ideally, the value of D should be maintained between 10 and 15 during standard equipment operation. Our findings offer theoretical insights for the practical implementation of C ₆ F ₁₂ O-based phase change cooling technology.