Effective Thermal Conductivity of Cloth With Moisture Diffusion

1.局部湿度计对实验装置和实验的改进在堆积布料中，总平均有效导热系数与局部平均有效导热系数存在差异。为了消除这些现象，我们研制了一种局部湿度计，可以测量堆积衣物中任意位置的湿度值，我们发现了定性的趋势，但数据具有很大的分散性。因此，我们必须做更精确的实验来获得定量关联。改进的堆积布模型及数值模拟提出了堆积布和纤维复合材料的改进模型。采用基于有限差分法的数值模拟方法，研究了周期性加热现象的温度响应和热扩散率的估算。考察的因素有热扩散率、组分材料的热容和温度波周期。提出了一种通过测量有限厚度试件后表面的振幅来评价热扩散率的新方法。

Main results obtained in this study are as follows :1. Improvement of experimental appratus and experiment by using local hygrometerIn the piled cloths, there are the differences between total mean effective thermal conductivity and local one. To clear these phenomena, we had been developed the local hygrometer that could measure humidity values at arbitrary position in the piled cloths.We found out qualitative trend, but the data have large scattering. Therefore, we must do more accurate experiment to obtain the quantitative correlation.2. Propose of the improved piled cloth model and numerical simulationThe improved model for piled cloths and fibrous composite matrerials has been proposed. The temperature responce and evaluation of thermal diffusivity were studied on the period-ical heating phenomena by using numerical simulation based on finite difference method. Investigated factors were thermal diffusivity, heat capacity of component materials and period of temperature wave. A new method to evaluate thermal diffusivity was also proposed by measuring the amplitude at the rear surface of specimen having finite thickness.