一軸配向繊維集合体の繊維軸に平行方向の有効熱伝導度の評価

抄録

This paper describes the model analysis to calculate the effective thermal conductivity parallel to fiber axes of unidirectionally oriented fiber assembly. This analysis takes account of not only the heat conduction but also the heat radiation as the same way in the previous paper. The property of this heat transfer is discussed and compared with the result perpendicular to fiber axes obtained in previous paper²⁾.
The conclusions are as follows.
(1) From this analysis, the conductive and the radiative (between the two plates) components of the effective thermal conductivity parallel to fiber axes tend to the same behavior as that perpendicular to fiber axes obtained in the previous paper. However, the radiative component between fiber and plate is different from that perpendicular to fiber axes and holds approximately constant regardless of the change of the volumetric ratio.
(2) The effective thermal conductivity consisting of those three components has the minimum value when the volumetric ratio is about 0.005 less than that perpendicular to fiber axes. Furthermore, the value of the effective thermal conductivity parallel to fiber axes is larger than that perpendicular to fiber axes, and this difference is due to the difference of the radiative heat transfer between fiber and plate.