Breakdown Characteristics of Multiphase Evaporative Coolant

With the rapid development of new energy power equipment and high-power electronic devices, the heat flux density generated during the operation of equipment has been continuously increasing, and the heat dissipation bottleneck has become a critical constraint on performance enhancement and operational safety. Evaporative cooling technology, which utilizes the latent heat of phase change of evaporative coolant to achieve cooling, has become an effective solution to the heat dissipation problem in scenarios with high heat flux density. During the operation of evaporative cooling systems, the evaporative coolant may be in liquid phase, gas-liquid two-phase, or even pure gas phase. Both the phase states and working frequency have an impact on the insulation performance of the coolant. This paper investigated the breakdown characteristics of a polar evaporative coolant in multiphase states, within a frequency range of 50–150 Hz. Through experimental testing and comparative analysis, the variation laws of the insulation breakdown strength of evaporative coolant with phase state and frequency were obtained. The relevant research can provide theoretical and experimental support for the application of evaporative cooling technology, and is of great significance for the design of evaporative cooling systems.