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通过推导2种不同换热边界条件下平板夹层多孔材料的散热指标,研究了考虑对流换热因素的平板夹层多孔材料主动散热性能,得到了影响材料散热性能的因素。分析了在确定的相对厚度下,不同构型多孔材料的相对密度与散热指标的关系,并得出正六边形构型的散热指数最大。随着相对厚度的增大,最大散热指标和最优相对密度增大较快,当相对厚度大于20时,最大散热指标和最优相对密度变化较小并最终趋于定值。由上述结果可以得到相对应的最小质量,随着最小质量的增大,最大散热指标增大并最终趋于定值。在相同的最大散热指标下,随着表面换热系数比值的增大,最小质量逐渐减小。最后考虑承载因素对结构进行了优化分析,正六边形构型的多孔材料具有明显的综合性能优势。
By deducing the heat dissipation index of the porous plate with two different heat transfer boundary conditions, the active heat dissipation performance of the porous plate sandwich materials considering the convection heat transfer was studied, and the factors affecting the heat dissipation performance were obtained. The relationship between the relative density and the heat sinking index of porous materials with different configurations under the certain relative thickness was analyzed. And the heat sink index of the regular hexagon configuration was the largest. With the increase of relative thickness, the maximum heat dissipation index and the optimal relative density increase rapidly. When the relative thickness is greater than 20, the maximum heat dissipation index and the optimal relative density change little and finally tend to set value. From the above results, the corresponding minimum mass can be obtained. With the increase of the minimum mass, the maximum heat dissipation index increases and eventually approaches a fixed value. Under the same maximum heat sinking index, the minimum mass gradually decreases with the increase of the surface heat transfer coefficient. Finally, considering the load-bearing factors, the structure was optimized and analyzed. The regular hexagonal porous material has the obvious advantages of comprehensive performance.