title: Thermal Conductivity of Saturated Liquid Toluene by Use of Anodized Tantalum Hot Wires at High Temperatures.
abstract: Absolute measurements of the thermal conductivity of a distilled and dried sample of toluene near saturation are reported. The transient hot-wire technique with an anodized tantalum hot wire was used. The thermal conductivities were measured at temperatures from 300 K to 550 K at different applied power levels to assess the uncertainty with which it is possible to measure liquid thermal conductivity over wide temperature ranges with an anodized tantalum wire. The wire resistance versus temperature was monitored throughout the measurements to study the stability of the wire calibration. The relative expanded uncertainty of the resulting data at the level of 2 standard deviations (coverage factor k = 2) is 0.5 % up to 480 K and 1.5 % between 480 K and 550 K, and is limited by drift in the wire calibration at temperatures above 450 K. Significant thermal-radiation effects are observed at the highest temperatures. The radiation-corrected results agree well with data from transient hot-wire measurements with bare platinum hot wires as well as with data derived from thermal diffusivities obtained using light-scattering techniques.
authors.affiliation: National Institute of Standards and Technology, Boulder, CO 80303, USA.
authors.forename: R A
authors.initials: RA
authors.lastname: Perkins
authors.affiliation: Departmento de Química e Bioquímica and Centro de Ciência e Tecnologia de Materiais, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C1, Piso 5, 1700 Lisboa, Portugal.
authors.forename: M L
authors.initials: ML
authors.lastname: Ramires
authors.affiliation: Departmento de Química e Bioquímica and Centro de Ciência e Tecnologia de Materiais, Faculdade de Ciências da Universidade de Lisboa, Campo Grande Ed. C1, Piso 5, 1700 Lisboa, Portugal.
authors.forename: C A
authors.initials: CA
authors.lastname: Nieto de Castro
keywords: anodized tantalum wire; liquid; thermal conductivity; thermal radiation; toluene; transient hot-wire