Abstract
Deriving the equation which gives the distribution of temperature in clothing assemly heated by a line souce, we showed that the thermal diffusivity and thermal conductivity of fabrics in the direction parallel to warps and fillings and normal to the fabric surface will be determined by using this equation. Heat is liberated at constant rate per unit time per unit length of a line source placed in the middle of samples which are formed with many fabrics accumulated to be paralleled with eachother for the warps or fillings.
Four fabrics, varying in thickness, construction, and fiber content were chosen for study. The results have proved the fact that the thermal conductivity of fabric in the direction parallel to its surface is larger than that normal to it, and the significant differences are found for the filament yarn fabrics. And further, the thermal conductivity of fabric in the direction parallel to the warps arranged more closely was larger than that in the direction parallel to the fillings, and good agreement between the temperature calcurated by means of the observed thermal properties and experimentals was found on any point in the sample. The above-stated facts appear to show this method to be relied upon.
