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

以研制高效、高性能的冷却装置为目标，对微细通道内的微泡发射池形核沸腾和强制对流沸腾进行基础研究。通过池沸腾系统的实验发现，高过冷条件下，最大临界热通量达到10 MW/m2，气泡尺寸一般为几十微米，高过冷条件下气泡尺寸一般在几十微米左右。从视频观察发现，微气泡形成的机理与气泡表面的不稳定性有关。通过微通道和微型通道的流动沸腾实验发现，当通道长度小于适当长度时，流动压力损失小，传热效率高。还发现，如果我们在水中使用特殊的溶质，例如丁烷，则可以阻止干燥的发生或延长干燥的位置。通过这些实验研究，可以说我们可以考虑利用微气泡发射沸腾和微小型通道的高效、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.