FLUENT模拟分析巴基纸基复合材料的温度场分布

Temperature field distribution of buckypaper/polymer composites based on FLUENT simulation

为了研究加热过程中加热功率及聚合物基体导热系数等因素对巴基纸基复合材料达到稳态所需时间及温度场分布的影响规律,采用有限元软件FLUENT分别模拟了不同工况条件下矩形弯曲、正弦形及平板形巴基纸增强聚合物基复合材料的热传导性能。计算结果表明:三种形状巴基纸基复合材料加热达到稳态后整体温度水平均随加热功率的增大呈线性增长,且巴基纸基复合材料达到稳态时所需时间也随加热功率的增大而延长。随着聚合物基体材料导热系数的增大,巴基纸基复合材料温度分布更加均匀,且巴基纸基复合材料达到稳态所需要的时间越短。分析认为,加热功率对巴基纸基复合材料温度分布规律的影响主要通过巴基纸加热片的单位体积热源起作用;聚合物基体导热系数增大利于巴基纸加热片热量的散出,因此缩短了巴基纸基复合材料达到稳态的所需时间。

To study the effects of heating power and thermal conductivity of polymer matrix on the time necessary for buckypaper composites to reach steady state as well as the distribution of temperature field,the finite-element software FLUENT was used to analyze the thermal conductivities of slant,sinusoidal,and flat plates of buckypaper-reinforced polymer-based composites under different working conditions. The results show that after the three shapes of buckypaper-reinforced composite are heated to steady state,the integral temperature levels increased linearly with the heating power. In addition,the time necessary for buckypaper-reinforced composites to reach steady state also elongated following the increase of heating power. Moreover,following the increase in the thermal conductivity of the composites,the temperature distribution of the composites became more even,and the time necessary for them to reach steady state shortened. It was concluded by analysis that the effect of heating power on the temperature distribution of a buckypaper-reinforced polymer-based composite is mainly realized through the unit volume of heat of buckypaper heating sheets. An increase of the thermal conductivity of the polymer matrix is favorable for heat dissipation of buckypaper heating sheets; therefore,the time necessary for buckypaper composite to reach steady state would be short.