Özet:
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.