Open AccessDevelopment of measurement setup for thermal conductivity at high temperatures using the parallel hot-wire
Author(s) -
Wim Beyne,
Kenny Couvreur,
Andrey Vancoillie,
Michel De Paepe
Publication year - 2021
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2116/1/012040
Subject(s) - thermal conductivity , thermal conductivity measurement , materials science , thermal , transient (computer programming) , melting point , thermal conduction , thermodynamics , conductivity , temperature measurement , natural convection , convection , thermal transmittance , analytical chemistry (journal) , thermal resistance , composite material , chemistry , chromatography , physics , computer science , operating system
An experimental setup is built to determine the thermal conductivity of a mixture of KNO3 and NaNO3 with a ratio of 54-46m% which is used in high temperature thermal storage systems. The measurement principle is based on the transient parallel hot-wire method which is described in the standards NBN B 62-202 and ISO 8892-2. The setup is designed to measure the thermal conductivity around the melting temperature (<300°C). Measurements within the liquid region show faulty results caused by natural convection within the sample. The measured thermal conductivity within the solid region is 0.5466-0.5529W/mK close to the melting point and 0.7174W/mK at room temperature, which shows a decreasing thermal conductivity with increasing temperature in the solid region.