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開(kāi)孔泡沫金屬熱傳導(dǎo)性能的理論研究與數(shù)值模擬
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國(guó)家自然科學(xué)基金 (11072166, 90716005, 10802055, 10972153)


Theoretical Study and Numerical Simulation of Effective Thermal Conductivities of Open-Cell Metallic Foam
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    摘要:

    基于Ashby的規(guī)則正立方體單胞模型，研究了輕質(zhì)泡沫金屬材料的拓?fù)錁?gòu)型（孔隙率和孔徑大?。?duì)其熱傳導(dǎo)性能的影響。利用最小熱阻法推導(dǎo)了開(kāi)孔泡沫金屬氣固兩相的等效熱傳導(dǎo)系數(shù)的表達(dá)式，并首次采用簡(jiǎn)化的積分方法，得到了等效熱傳導(dǎo)系數(shù)的近似解析解。應(yīng)用ABAQUS有限元分析軟件模擬了開(kāi)孔泡沫金屬橫斷面的熱流密度分布和穩(wěn)態(tài)熱傳導(dǎo)Fourier定律，分析了不同孔隙率和孔徑大小開(kāi)孔泡沫材料的熱傳導(dǎo)性能。結(jié)果表明，多孔泡沫金屬的熱傳導(dǎo)系數(shù)隨著孔隙率的增大而線性減小，且當(dāng)孔隙率保持恒定時(shí)，熱傳導(dǎo)系數(shù)與孔徑的大小無(wú)關(guān)。理論分析和數(shù)值模擬結(jié)果吻合較好。研究結(jié)果對(duì)多孔金屬的工程應(yīng)用具有重要的參考價(jià)值

    Abstract:

    Based on the cubic model developed by Ashby, the effects of the topology structure of light metallic foam such as porosity and cell size on its effective thermal conductivities were investigated. Using the least thermal resistance method, the expression of effective thermal conductivities was derived, and the approximate analytic solution was first obtained by employing the simplified integral method. The distribution of heat flux across the open-cell metallic foam and the steady Fourier law were simulated by ABAQUS software in order to determine the influence of porosity and cell size on the thermal conductivities of the open-cell metallic foam materials. The finding of this paper indicates that the effective thermal conductivities of porous metallic foam almost linearly decrease with the increase of porosity, and they have no change with the cell size when the porosity keeps constant. The theoretical study agrees well with the numerical data. The research results are significant to the practical engineering application of metallic foams.

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習(xí)常清,李志強(qiáng),敬 霖,王志華,趙隆茂.開(kāi)孔泡沫金屬熱傳導(dǎo)性能的理論研究與數(shù)值模擬[J].稀有金屬材料與工程,2014,43(3):686~691.[Xi Changqing, Li Zhiqiang, Jing Lin, Wang Zhihua, Zhao Longmao. Theoretical Study and Numerical Simulation of Effective Thermal Conductivities of Open-Cell Metallic Foam[J]. Rare Metal Materials and Engineering,2014,43(3):686~691.]
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  • 收稿日期:2013-03-20
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  • 在線發(fā)布日期: 2014-06-27
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