Effective Thermal Conductivity of Cloth With Moisture Diffusion

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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.