Application of the Quasi-Regular Cooling Regime Method to Experimental Determination of the Thermophysical Parameters of Textile Materials

作者：Sokolovskii R I^*; Shablygin M V

来源：Fibre Chemistry, 2015, 47(2): 108-116.

DOI：10.1007/s10692-015-9647-4

We have experimentally established that the surface temperature of vertically positioned flat samples, made from textile materials and previously uniformly heated to temperatures in the range 60A degrees-80A degrees C, under natural convection conditions varies with time according to a single law defined by two constants m and mu, respectively having the meaning of cooling rate and the change in cooling rate. The parameters m and mu of the cooling curve depend on the geometric and thermophysical characteristics of the test materials. We give a theoretical explanation for the time dependence of the cooling curve, based on solution of the nonlinear thermal conductivity problem. Based on the constructed theory, we find the correlation between the parameters of the cooling curve and the thermophysical characteristics of textile material. We propose an analytical method for using the values of the constants of the cooling curve to determine the thermophysical constants of textile materials. We show that the overall accuracy in the determination of the thermophysical constants of materials from the cooling curve is mainly limited by the measurements of the geometric characteristics of the samples, and is within 5% of the values of the thermophysical constants. We have conducted experimental studies to determine the thermal conductivity coefficient for needlepunched nonwoven fiber material as a function of the thermophysical parameters of its constituent components. The studies allowed us to find a quantitative correlation between the composition of the nonwoven material and its thermal insulation properties.

• 出版日期2015-7