Temperature dependency of thermal conductivity of solid phases for fatty acids; lauric, myrsistic, pivalic and stearic acids

Abstract

Thermal conductivity variations with tempera ture of solid phases for lauric acid (LA), myristic acid (MA), pivalic acid (PA), and stearic acid (SA) have been measured with radial heat-flow method. Temperature dependencies of the thermal conductivity for same organic materials have been obtained by linear regression analysis. From graphs of thermal conductivity versus temperature, the thermal conductivity of solid phase at their melting temperature and temperature coefficients of thermal con ductivity for LA, MA, PA, and SA have been found to be 0.37, 0.39, 0.23, and 0.35 W K-1 m-1 and 0.00935, 0.00446, 0.01095, and 0.00295 K-1 , respectively. The ratios of thermal conductivity of liquid phase to thermal conductivity of solid phase for LA, MA, PA, and SA have also been measured to be 0.52, 0.48, 0.25, and 0.59, respectively, with a Bridgman-type directional solidifica tion apparatus.