| 单层元胞结构金属泡沫的透射特性 |
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| 引用本文： | 刘剑,赵军明,刘林华.单层元胞结构金属泡沫的透射特性[J].工程热物理学报,2010(12). |
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| 作者姓名： | 刘剑 赵军明 刘林华 |
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| 作者单位： | 哈尔滨工业大学能源科学与工程学院;哈尔滨工业大学(威海)汽车工程学院; |
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| 基金项目： | 国家自然科学基金项目(No.50836002;No.50906017) |
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| 摘 要： | 本文构建了开孔泡沫铝的简化几何模型,并利用有限积分法模拟了具有单层元胞结构的金属泡沫材料在线性极化平面波垂直入射情况下的透射率。基于菲涅耳-基尔霍夫衍射理论分析了孔隙率、孔径尺寸、材料厚度和骨架结构对金属泡沫材料辐射特性的影响。当尺度参数较大时,金属泡沫材料的固相支架结构满足良导体条件,宏观电磁屏蔽效应显著,金属泡沫材料呈现"非透明"性质。随着入射电磁波波长逐渐接近于孔径尺寸,散射效应越来越显著,金属泡沫材料的"半透明"性质开始显现,不同孔隙率的金属泡沫材料的透射率以相近的规律随波长变化。随着波长的进一步减小,衍射效应对于金属泡沫材料透射特性的影响逐渐占据主导地位,采用菲涅耳-基尔霍夫衍射理论可以较好地描述透射能流在孔隙结构内的分布。当衍射效应占据主导地位时,对于相同孔隙率金属泡沫材料,孔径尺寸对衍射光学行为影响不大,而材料厚度、孔隙率和骨架结构会显著影响金属泡沫材料的透射率。
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| 关 键 词： | 有限积分法 金属泡沫材料 透射率 衍射效应 |
TRANSMITTANCE CHARACTERISTICS OF METAL FOAMS WITH SINGLE LAYER CELLULAR STRUCTURE |
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| LIU Jian ZHAO Jun-Ming LIU Lin-Hua.TRANSMITTANCE CHARACTERISTICS OF METAL FOAMS WITH SINGLE LAYER CELLULAR STRUCTURE[J].Journal of Engineering Thermophysics,2010(12). |
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| Authors: | LIU Jian ZHAO Jun-Ming LIU Lin-Hua |
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| Institution: | LIU Jian~1 ZHAO Jun-Ming~1 LIU Lin-Hua~(1,2) (1.School of Energy Science and Engineering,Harbin Institute of Technology Harbin 150001,China,2.School of Auto Engineering,Harbin Institute of Technology at Weihai,Weihai 264209,China) |
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| Abstract: | Simplified geometric model of open-cell aluminum metal foams is developed in this article. The transmittance of unit cell of metal foams with single layer cellular structure normally illuminated by linear polarized plane wave is obtained using Finite Integral Method.Based on Fresnel-Kirchhoff diffraction theory influence of porosity pore size,thickness and ligament structure on radiative properties of metal foams is analyzed.As the wavelength of incident electromagnetic wave approaches the pore size,scatter... |
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| Keywords: | finite integral method metal foams transmittance diffraction effect |
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