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运用热线法测量了碳纳米管堆积床在120 K-370 K温度范围内的导热系数和传热松弛时间。测量数据表明:碳纳米管床导热系数极低,其在低温段随温度升高呈线性增加,在高于室温的范围趋于稳定。测量过程中碳纳米管床表现出的传热松弛时间,较已有文献报道的最大的碳纳米管床传热松弛时间大一个数量级。基于此数据并结合经典的(CV双曲型热传导)模型分析单个碳纳米管接触节点上的瞬态导热及热电特性,分析认为:利用纳米多孔材料的传热延迟特性可提高瞬态热电转换效率。
The heat transfer coefficient and heat transfer relaxation time of carbon nanotube packed bed in the temperature range of 120 K-370 K were measured by hot-wire method. The measurement data show that the thermal conductivity of carbon nanotube bed is very low, which increases linearly with increasing temperature at low temperature, and tends to be stable at room temperature. The heat transfer relaxation time of the CNTs during the measurement is one order of magnitude larger than that of the largest CNT heat transfer relaxation reported in the literature. Based on this data and the classical (CV hyperbolic heat conduction) model, the transient thermal and thermoelectric properties at the contact points of single carbon nanotubes were analyzed. The analysis shows that the use of heat transfer delay characteristics of nano-porous materials can improve the transient thermoelectric conversion efficiency .