The isobaric thermal conductivity of solid CH2Cl2 was investigated by the linear-flow method under saturated vapor pressures in the temperature range from 80 K to the corresponding melting temperature and then recalculated for a constant density of the samples. The temperature dependence of isochoric thermal conductivity of solid CH2Cl2 is explained within a model in which the heat is transferred by phonons and above the phonon mobility edge by "diffusive" modes migrating randomly from site to site. The pressure dependence of the thermal conductivity of solid CH2Cl2 has been obtained.
The influence of the thermal expansion on heat transfer processes has been considered in orientationally ordered molecular crystals. A modified method of reduced coordinates was used to separate phonon-phonon and phonon-rotational contributions to the total thermal resistance in isobaric and isochoric cases. It was shown that a discrepancy between temperature dependences of the isobaric (Λp) and isochoric (Λv) thermal conductivity is mainly governed by the intensity of a phonon-phonon interaction because the phonon-rotational component of thermal resistance weakly depends on thermal expansion.
The influence of molecular rotation on the volume dependence of thermal conductivity in liquid nitrogen was evaluated. A modified method of reduced coordinates has been used to calculate components of the isochoric heat capacity of liquid nitrogen. A difference in the behavior of temperature dependences of the Bridgman coefficient at pre-crystallization temperatures in liquid Ar, CH4 and N2 is explained by the influence of rotational motion of molecules.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.