Simultaneous measurement of thermal conductivity and emissivity of micro/nanomaterials

IF 2.8 2区 工程技术 Q2 ENGINEERING, MECHANICAL
Jinyu Chen, Jie Tang, Jinhui Liu
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Abstract

Although thermal conductivity of micro/nano scale material has been readily measured, the high specific surface area leads to non-negligible radiative heat transfer. Here, a method for simultaneous measurement of intrinsic thermal conductivity and emissivity of micro/nano materials was developed and verified. The physical model of this measurement principle consisted of two parallel platinum wires, which serve as both heaters and heat flux meters. Thermal conductivity and emissivity can be derived by comparing the changes in the average temperature rise of the heater and sensor platinum wires before and after attaching the test sample. The thermal conductivity and emissivity of an individual platinum wire were determined to 71.7 W/(m·K) and 0.14, which are consistent with the reference values. Subsequently, the thermal conductivity and emissivity of the polymer composite fiber were measured to be 1.45 W/(m·K), 0.73 and 1.87 W/(m·K), 0.8 at different composite filler concentrations. In principle, this method is applicable for accurately measuring the thermal transport properties of any micro/nano wires using appropriate sensors.

同时测量微型/纳米材料的热导率和发射率
虽然微米/纳米级材料的导热率很容易测量,但高比表面积会导致不可忽略的辐射传热。在此,我们开发并验证了一种同时测量微米/纳米材料固有热导率和辐射率的方法。该测量原理的物理模型由两根平行的铂丝组成,它们既是加热器又是热通量计。通过比较加热器和传感器铂丝在安装测试样品前后的平均温升变化,可以得出热导率和发射率。经测定,单根铂丝的热导率和发射率分别为 71.7 W/(m-K) 和 0.14,与参考值一致。随后,在不同的复合填料浓度下,测得聚合物复合纤维的导热系数和发射率分别为 1.45 W/(m-K), 0.73 和 1.87 W/(m-K), 0.8。原则上,这种方法适用于使用适当的传感器精确测量任何微型/纳米线的热传输特性。
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来源期刊
Experimental Thermal and Fluid Science
Experimental Thermal and Fluid Science 工程技术-工程:机械
CiteScore
6.70
自引率
3.10%
发文量
159
审稿时长
34 days
期刊介绍: Experimental Thermal and Fluid Science provides a forum for research emphasizing experimental work that enhances fundamental understanding of heat transfer, thermodynamics, and fluid mechanics. In addition to the principal areas of research, the journal covers research results in related fields, including combined heat and mass transfer, flows with phase transition, micro- and nano-scale systems, multiphase flow, combustion, radiative transfer, porous media, cryogenics, turbulence, and novel experimental techniques.
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