材料期刊网

为了研究纳米纸加热片的形状控制、厚度及弯曲周期等因素对纳米纸/聚合物基复合材料达到稳态时温度分布的影响规律,采用FLUENT有限元软件分别模拟研究了不同工况条件下矩形弯曲及平板形纳米纸/聚合物基复合材料的热传导性能.计算结果表明:加热过程中矩形弯曲纳米纸/聚合物基复合材料的平均温度略低,加热速率略慢,达到稳态所需的时间稍短,温度分布更为均匀.纳米纸加热片厚度越小、弯曲周期越小,纳米纸/聚合物基复合材料达到稳态时的平均温度水平越高,达到稳态所需的时间越长.分析认为,纳米纸加热片的厚度和弯曲周期对纳米纸/聚合物基复合材料达到稳态所需时间及温度分布规律的影响主要通过纳米纸加热片的单位体积热源起作用;对流散热速率低于产热量的增大导致纳米纸/聚合物基复合材料达到稳态所需时间增长.

In order to study the effect of buckypaper heating sheet with shape control, thickness and bending cycles on the temperature distribution of the buckypaper/polymer composites when reaching the steady state, FLUENT is used to analyze the thermal conductivity of the polymer-based composites reinforced by flat and bending nanopaper under different working conditions.The calculation results show that the average temperature of the nanocomposite with pulse bending nanopaper is lower, the heating rate is slower and the time to reach the steady state is shorter in the heating process.The smaller the thickness of nanopaper heating sheets is, the smaller the bending cycle is.The higher the average temperature is, the time of the polymer-based composites reinforced by nanopaper reaching the steady state is longer.It is concluded that the required time for the thickness and bending cycles of nanopaper heating sheets to enhance the polymer-based composites to reach the steady state and the effect of temperature distribution is mainly done through the unit volume heat of nanopaper heating sheets.Because the heat dissipation rate is lower than the increase rate of heat production, it takes longer time for the polymer-based composites reinforced by nanopaper to reach the steady state.