title: Thermal conductivity of simple liquids: origin of temperature and packing fraction dependences.
abstract: The origin of both weak temperature dependence and packing fraction dependence of T(1/4)η(3/2) in the thermal conductivity of the simple Lennard-Jones (LJ) liquid is explored. In order to discuss the relative contributions from attractive or repulsive part of the interaction potential separately, the thermal conductivity of a series of Weeks-Chandler-Anderson (WCA) fluids is calculated by molecular dynamics simulations. The results show that the repulsive part plays the main role in the heat conduction, while the attractive part has no direct effect on the thermal conductivity for a given packing fraction. By investigating WCA fluids with potentials of varying softness, we explain the difference observed between the LJ liquids such as argon and Coulombic liquids such as NaCl.
authors.affiliation: Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Ishii
authors.affiliation: Graduate School of Science and Technology, Niigata University, 8050 Ikarashi 2-no cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Keisuke
authors.initials: K
authors.lastname: Sato
authors.affiliation: Sorbonne Universités, UPMC Univ Paris 06, UMR 8234, PHENIX, F-75005 Paris, France and CNRS, UMR 8234, PHENIX, F-75005 Paris, France.
authors.forename: Mathieu
authors.initials: M
authors.lastname: Salanne
authors.affiliation: Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, United Kingdom.
authors.forename: Paul A
authors.initials: PA
authors.lastname: Madden
authors.affiliation: Department of Chemistry, Niigata University, 8050 Ikarashi 2-no cho, Nishi-ku, Niigata 950-2181, Japan.
authors.forename: Norikazu
authors.initials: N
authors.lastname: Ohtori