Thermal conductivity of liquid metals using fiber-optic thermoreflectance

Measuring the thermal conductivity of high-temperature liquids is essential for advanced nuclear energy systems, where accurate thermophysical property data support reactor design, safety analysis, and model validation. In this study, we develop and demonstrate a fiber-optic frequency-domain thermoreflectance (fiber-FDTR) technique tailored for in situ measurements in high-temperature liquid environments. We report relative thermal conductivity measurements for liquid gallium up to 350 °C, as we