|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Characterization of Minerals, Metals and Materials
||Measuring the Thermal Conductivity of Molten Salts Using a Frequency-domain Hot-wire Technique
||Andrew Zhao, Matthew Wingert, Yasuhiro Kodera, Stephen Obrey, Javier Garay
|On-Site Speaker (Planned)
Next generation energy technologies, such as concentrated solar-thermal power and nuclear power, require high temperature molten salts to be used as heat transfer fluids. The thermal properties of molten salts are difficult to measure due to their high melting points and reactivity. Time-domain or steady-state measurements are traditionally used to measure the thermal conductivity of molten salts; however, there is a large spread in experimental values and disagreement in their temperature dependence, possibly due to convection. We present a novel frequency-domain, hot-wire technique designed to measure molten and reactive materials at high temperature and to support the development of heat transfer fluids. By operating in the frequency-domain, we can lower the thermal penetration depth below 100 micrometers and minimize convection. We provide the first frequency-domain measurements of molten sodium nitrate, potassium nitrate, and their mixture up to 500°C and discuss the relationship between their liquid structure and thermal conductivity.