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针对航天器中电子器件的高效冷却问题,本文通过千式腐蚀技术在单晶硅表面形成一种新的柱状微结构(PF50-120),通过控制加热电压方法,在北京落塔进行了持续3.6 s有效微重力时间的过冷FC-72池沸腾强化换热实验研究.同时.通过高速摄像对壁面气泡动力学行为进行观测分析,结果发现柱状微结构不仅可以有效增加核态沸腾汽化核心数目,而且其独立于重力作用的毛细作用力可以驱动新鲜液体不断向附着在壁面上的大气泡底部供应,在较高热流密度下,柱状微结构表面仍然可以维持稳定的核态池沸腾换热,相比于光滑表面,强化换热效果显著.
In order to solve the problem of efficient cooling of electronic devices in spacecraft, a new columnar microstructure (PF50-120) was formed on the surface of monocrystalline silicon by the Thousand-Corrosion Technique. By controlling the heating voltage, s experimental study on the enhancement of effervescent FC-72 pool boiling at effective microgravity time.At the same time, the dynamic behavior of wall bubbles was observed and analyzed by high-speed camera, and the results showed that the columnar microstructure can not only increase the number of nucleate boiling nucleation, And its capillary action independent of gravity can drive the fresh liquid to continuously supply to the bottom of the large bubble attached to the wall. Under high heat flux density, the surface of the columnar microstructure can still maintain stable nucleate pool boiling heat transfer. Than the smooth surface, enhanced heat transfer significantly.