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In this study, the effective thermal conductivity of Cupra, Polyester and Polytrimethyleneterephthalate (PTT) fiber assemblies in low fiber volume fraction is measured using KES-F7 Thermo Labo II apparatus. In order to eliminate thermal perturbation by external heat, the radiation shielding board is set up between samples and operator. Heat flux to calculate thermal conductivity is measured including heat leakage from the side wall of sample and is calibrated in the analysis. The results are analyzed using non-linear regression method. The results are obtained as follows. Thermal conductivity curve is convex downward within the range of fiber volume fraction measured. The effective thermal conductivity, λ is expressed as following equation, λ = Aφ + B/φ + C where, φ: fiber volume fraction, A, B: coefficients and C: constant determined by non-linear regression analysis. Based on this equation, the effective thermal conductivity is divided into three parts, i.e. Aφ: heat conduction within fiber, B/φ: radiative heat transfer and C: heat conduction within air. Component of conduction in air, C plays a most important role in thermal conductivity of fiber assembly, and component of heat conduction in fiber, Aφ follows in higher fiber volume fraction.

Measurement of Effective Thermal Conductivity of Cupra and Polyester Fiber Assemblies in Low Fiber Volume Fraction