Open AccessA Novel Technique for the Measurement of the Effective Thermal Conductivity of Thermal Insulating Materials up to 1000°C
Author(s) -
Zenghua Gao,
Yang Wang,
Jinshuai Zhou,
Tao Yuan,
Xian Wu
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/678/1/012025
Subject(s) - thermal conductivity , thermal conductivity measurement , materials science , thermal , inert gas , temperature gradient , composite material , thermal transmittance , inert , atmospheric temperature range , thermal diffusivity , thermal resistance , thermodynamics , chemistry , physics , meteorology , organic chemistry
A novel large temperature gradient steady-state technique for the measurement of the effective thermal conductivity of thermal insulating materials up to 1000°C has been developed. With the incorporation of a vacuum system, the mean effective thermal conductivity of thermal insulating materials under certain temperature gradient in air and/or inert atmospheres with the gas pressure range of 10 −2 Pa to 10 5 Pa can be measured. A transforming method was proposed to derive the true effective thermal conductivity from the as-measured mean effective thermal conductivity. By evaluating the measurement uncertainty of the constructed testing apparatus as well as comparing experimentally with the guarded hot plate test results, the measurement accuracy of this technique was determined to have an accuracy of less than 8.5%.