胡斌,齐迪,徐永生,林梅

• 1:西安交通大学能源与动力工程学院
• 2:南方电网科学研究院有限责任公司直流输电技术国家重点实验室

摘要(Abstract)：

为提升散热量不断增加的电力电子器件冷却系统的高效换热能力，提出采用全氟己酮为工质的水平双直角五边形肋柱通道流动沸腾换热系统对其进行冷却。通过实验的方法制作了入口当量直径为3.81 mm的五边形柱群通道结构，对通道内流动沸腾的平均及沿程换热特性展开了研究，实验工况如下：壁面热流密度为50～400 kW·m~(-2),入口流速为0.1～0.9 m·s~(-1),入口过冷度为15～35℃。结果表明：当热流密度低于100 kW·m~(-2)时，单相对流占主导，增加流速与过冷度能够明显促进壁温降低；当热流密度高于200 kW·m~(-2)时，沸腾吸热占主导，增加流速与过冷度时壁温的降低幅度不明显；在热流密度为400 kW·m~(-2)、过冷度为15℃的工况下，柱群通道的平均传热系数最高；通道沿流向的局部传热系数总体呈现上升趋势，随着热流密度的增大、流速与过冷度的降低，通道出口传热系数相比进口的增长更加显著，此时通道内流体沿流向的沸腾剧烈程度发展速度更快、通道出口的沸腾程度更剧烈。该研究可为水平柱群通道内流动沸腾传热的最佳工况设计提供理论基础。

关键词(KeyWords)： 电子器件冷却;过冷沸腾;水平柱群通道;双直角五边形肋柱;传热特性

Abstract:

Keywords:

基金项目(Foundation): 国家自然科学基金资助项目（51876146）

作者(Author): 胡斌,齐迪,徐永生,林梅

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