Abstract
Abstract In this article, the authors first introduced a theoretical model dealing with unsteady-state heat conduction in porous fabric to assess the effects due to local convection during the testing. A few important issues are analyzed including the criterion for local thermal equilibrium in the fibrous materials and the confidence time region (tmin–tmax) during measuring process. The influence due to different heat source capacities can be ignored if the measuring time is greater than the minimum time duration tmin, yet the heat loss via outside surface becomes negligible if the testing duration is below the maximum allowable value tmax. Accordingly an apparatus that can simultaneously measure two thermophysical properties (the thermal conductivity k and thermal diffusivity a) of fibrous materials is developed in this study, which then leads to the determination of the volumetric capacity via ρC = k/a. In order to minimize the influence of potential local micro heat convection and the contact resistanc...
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