不同形状颗粒弥散复合材料的等效导热系数
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"十一五"信息对抗国防预研项目(41101050203)


Effective thermal conductivity of composites filled with different shape particles
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    摘要:

    根据最小热阻力法和比等效导热系数法对不同形状颗粒弥散复合材料的等效导热系数进行预测.采用以颗粒在传热方向上的特征长度为边长的立方体体积与实际颗粒体积之比作为形状因子,对不同颗粒形状等效为立方体时的无量纲相对特征长度进行修正,基于形状因子进一步推导了适用于不同形状颗粒弥散复合材料在中低体积分数情况的等效导热系数通用计算公式.此通用计算公式与实验值及其它模型计算值吻合较好,对于导热增强型复合材料,体积分数一定时,其等效导热系数与颗粒形状因子呈正比,增加颗粒在传热方向上的尺寸能有效提高复合材料的导热性能.

    Abstract:

    Based on the laws of the minimal thermal resistance and the specific effective thermal conductivity, this paper predicts the effective thermal conductivity of composites filled with different shape particles. When the particle shape is equivalent to the cube which used character length of particle in the direction of heat transfer as edge length, the dimensionless relative character length is amended using the volume ratio of the cube and factual particle as shape factor. Based on the shape factor, 〖BP(〗it developed the〖BP)〗 universal expression of the effective thermal conductivity is developed, which is adaptive to the composites filled with different shape particles and its volume fraction is medium and lower. The calculation results of the universal expression accord well with that of experiments and other models, the effective thermal conductivity increases in direct proportion to shape factors for heat conduction enhanced composites when volume fraction is invariable, and the thermal conductivity of composites can be enhanced by increasing the dimension of particle in heat transfer direction.

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宋思洪,廖强,沈卫东.不同形状颗粒弥散复合材料的等效导热系数[J].重庆大学学报,2011,34(6):87-91.

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  • 收稿日期:2010-12-07
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