Fundamental research on the development of a high-performance cooling system utilizing microbubbles emission boiling and a mini-channel

以开发高效高性能冷却装置为目标，开展了微气泡发射池核态沸腾和微小型通道内强制对流沸腾的基础研究。池沸腾实验发现，在高过冷度条件下，最大临界热流密度达到10 mW/m~2；在高过冷度条件下，气泡尺寸一般在几十微米到十微米左右。通过视频观察发现，微气泡的形成机理与气泡表面的不稳定性有关。通过微通道和微通道内的流动沸腾实验发现，当通道长度小于适当长度时，流动的压力损失小，换热高。研究还发现，如果我们在水中使用一种特殊的溶质，如丁烷，就有可能防止干涸的发生或延长干涸的位置。通过这些实验研究，可以说我们可以考虑利用微气泡排放沸腾和微小型通道来实现高效、高性能的冷却装置。

With the aim of developing high-efficiency and high-performance cooling device, a fundamental researches of microbubble emission pool nucleate boiling and forced convection boiling in micro-mini channels. From the experiment of pool boiling system, it was found that maximum critical heat flux reaches 10 MW/m2 at high subcooling conditions and that the size of bubbles is generally a few tens micron meters and around ten micron meters at high subccolings. From the video observation, it was found that the mechanism of micro-bubble formation relates to the instability of bubble surface. From the flow boiling experiments in micro and mini channels, it was found that when the length of channel is less than a proper length, the pressure loss of flow is low with high heat transfer. It was also found that if we employ a special solute in water such as Butane, it is possible to prohibit the occurrence of dryout or extend the location of dryout. With these experimental researches, it may be said that we can consider the high-efficient, high-performance cooling device by utilizing microbubble emission boiling and micro-mini channels.