金属蜂窝夹芯面板有效导热系数的数值计算

对具有漫灰体内壁的金属蜂窝夹芯面板，忽略蜂窝内腔的空气导热，综合考虑蜂窝结构的热传导和热辐射等热传递过程，利用有限元方法求解了周期性分布的蜂窝单胞稳态热传导控制方程，蜂窝内壁的边界条件是由净热量法得到的热辐射换热积分方程，由胞元的温度场分布数据及Fourier定律得到了蜂窝结构的有效导热系数。与现有文献相比，采用了较少近似的模型及较高精度的离散方法，计算结果表明计算模型及方法是可靠有效的。

Numerical Simulation of Effective Thermal Conductivity of Metal Honeycomb Core Sandwich Panel

In this paper, the effective thermal conductivity of metal honeycomb core sandwich panel which have diffuse gray inner walls is analyzed. Ignoring gas conduction within the honeycomb cells, the coupled influence of solid conduction through honeycomb cell wall and heat transfer by radiation in the honeycomb enclosure is taken into consideration. Finite element method was used for solving the steadystate heat conduction equation in periodic distributed honey- comb cell, which takes integral equations of radiation heat flux on the honeycomb inner wall as radiation boundary conditions. By applying the Fourier＇ law, the effective thermal conductivity of honeycomb sandwich panel is derived from the temperature distribution data. Compared with the existing literature, the model in this article has less approximation for radiative heat exchange and the discrete method of this model has higher precision. The results show that the calculation model and method are valid and reliable.