Details

Autor(en) / Beteiligte

• Wang, Jiahao
• Hu, Feng
• Luo, Yongchao
• Wu, Yingyu
• Zhang, Chaohai
• Tian, Shuangshuang

Titel

Numerical Simulation of Phase Transition Evolution of Evaporative Cooling Medium C₆F₁₂O Under Inhomogeneous Electric Field

Ist Teil von

• IEEE transactions on dielectrics and electrical insulation, 2024-06, Vol.31 (3), p.1647-1650

Ort / Verlag

New York: IEEE

Erscheinungsjahr

2024

Quelle

IEL

Beschreibungen/Notizen

• <inline-formula> <tex-math notation="LaTeX">\text{C}_{{6}}\text{F}_{{12}}\text{O} </tex-math></inline-formula>, an environmentally friendly medium, is nonflammable and nonexplosive with excellent insulating properties. Moreover, it is economically favorable for phase change cooling technology that offers safe and efficient heat dissipation for high-power, large-capacity electrical equipment. Despite its potential, the application of <inline-formula> <tex-math notation="LaTeX">\text{C}_{{6}}\text{F}_{{12}}\text{O} </tex-math></inline-formula> 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 <inline-formula> <tex-math notation="LaTeX">\text{C}_{{6}}\text{F}_{{12}}\text{O} </tex-math></inline-formula> 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 (<inline-formula> <tex-math notation="LaTeX">{Bo}_{\text {E}} </tex-math></inline-formula>) enhance the release frequency and velocity of <inline-formula> <tex-math notation="LaTeX">\text{C}_{{6}}\text{F}_{{12}}\text{O} </tex-math></inline-formula> bubbles. The inhomogeneous electric field increases the stretching degree of bubble release, facilitating faster detachment. Furthermore, a warning coefficient <inline-formula> <tex-math notation="LaTeX">{D} </tex-math></inline-formula> is proposed to characterize the generation of bubble channels, which signifies the speed and frequency of bubble motion. The <inline-formula> <tex-math notation="LaTeX">{D} </tex-math></inline-formula> value below seven signals potential insulation performance degradation, necessitating caution; ideally, the value of <inline-formula> <tex-math notation="LaTeX">{D} </tex-math></inline-formula> should be maintained between 10 and 15 during standard equipment operation. Our findings offer theoretical insights for the practical implementation of <inline-formula> <tex-math notation="LaTeX">\text{C}_{{6}}\text{F}_{{12}} </tex-math></inline-formula> O-based phase change cooling technology.