微重力下微结构表面池沸腾气泡动力学研究
Pool Boiling Heat Transfer and Bubble Dynamics Over Micro-Pin-Finned Surface Under Microgravity
查看参考文献10篇
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文摘
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针对航天器中电子器件的高效冷却问题,本文通过干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。 |
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其他语种文摘
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For high-efficiently solving the power dissipation problem of electronic components on the spacecraft, experiments were performed using micro-pin-finned structure as heater surface in subcooled nucleate pool boiling of FC-72 under microgravity condition utilizing the drop tower Beijing. Micro-pin-fins with the dimensions of 50 μmxl20 μim (thickness x height) were fabricated on the surface of square silicon by using the dry etching technique. The micro-pin-finned silicon chip was heated by means of controlling heating voltage for the desired heat flux. At the same time, video of the bubble behavior was obtained by using high speed camera. The results showed that micro-pin-fins can increase the effective nucleate boiling sites number and the heat transfer performance efficiently, which stems from the sufficient supply of fresh liquid to the heater surface due to the capillary force independent of gravity. The steady nucleate pool boiling heat transfer on micro-pin-finned surface can be obtained at high heat fluxes and is greatly enhanced compared with smooth surface in microgravity. |
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来源
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工程热物理学报
,2013,34(11):2112-2115 【核心库】
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关键词
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池沸腾
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微重力
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柱状微结构
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强化换热
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地址
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1.
西安交通大学, 动力工程多相流国家重点实验室, 陕西, 西安, 710049
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中国科学院力学研究所, 微重力重点实验室(国家微重力实验室), 北京, 100190
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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0253-231X |
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学科
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能源与动力工程 |
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基金
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国家自然科学基金国家杰出青年科学基金
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国家自然科学基金
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中国科学院国家微重力重点实验室落塔资助项目
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文献收藏号
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CSCD:4998995
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参考文献 共
10
共1页
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