Thermal Conductivity of Carbon Tetrafluoride in the Dense Gaseous Region

Abstract

Using a coaxial cylindrical cell, thermal conductivities for carbon tetrafluoride have been measured for pressures up to 9610 psia and temperatures of 6.7°, 23.8°, and 41.7°C. Residual thermal conductivities, k—k*, resulting from these measurements were correlated with corresponding reduced densities, ρR, to produce for the three temperatures the unique relationship k—k*=1.72×10−5 [exp(ρR) −1]. This residual quantity, when related to the reduced thermal pressure—temperature ratio gave rise to the single relationship, k−k*=0.56×10−5(∂PR/∂TR)ρR0.845. These measured thermal conductivities were compared with values predicted from the Enskog theory, k/k*=bρ[(1/bρχ)+6/5+0.7574bρχ], where the Enskog modulus, bρχ, was obtained from existing PVT data for carbon tetrafluoride.