| 泡沫金属的热分析 |
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| 引用本文： | 刘晓丹,冯妍卉,杨雪飞,张欣欣.泡沫金属的热分析[J].北京科技大学学报,2009,31(7). |
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| 作者姓名： | 刘晓丹 冯妍卉 杨雪飞 张欣欣 |
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| 作者单位： | 北京科技大学机械工程学院,北京,100083 |
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| 摘 要： | 提出了一种高孔隙率开孔泡沫金属的结构简化几何模型,运用热电比拟理论在胞孔尺度上分析并求解了有效热导率的计算表达式,并根据已有实验数据进行模型修正.同时模拟分析了金属泡沫三维矩形通道内空气流动的对流换热情况,与实验结果进行了对比验证.研究表明,本文提出的胞孔有效热导率修正模型对铝泡沫金属有一定的适用性;相同孔隙率条件下,泡沫金属通道内强制对流的对流换热系数随孔密度的增加(即孔径的减小)而增大,但付出的代价是阻力也随之增大;相对而言,低孔密度的泡沫金属具有较好的对流换热综合性能.
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| 关 键 词： | 泡沫金属 有效热导率 对流换热 数值模拟 孔隙率 |
Thermal analysis on metal foams |
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| LIU Xiao-dan,FENG Yan-hui,YANG Xue-fei,ZHANG Xin-xin.Thermal analysis on metal foams[J].Journal of University of Science and Technology Beijing,2009,31(7). |
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| Authors: | LIU Xiao-dan FENG Yan-hui YANG Xue-fei ZHANG Xin-xin |
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| Abstract: | A simplified geometrical model of high porosity open-cell metal foams was constructed. A related expression of effective thermal conductivity of the metal foams was derived on the base of the analogy between thermal and electrical resistance at the scale of unit pore. The correlation was further modified by existing experimental data. In addition, convective heat transfer was numerically simulated for air flow in a metal-foam filled three-dimensional rectangular duct. The simulation results were analyzed an... |
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| Keywords: | metal foam effective thermal conductivity convection heat transfer numerical simulation porosity |
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