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Thermal conductivity of high temperature fluoride molten salt determined by Laser Flash method (CAT#: STEM-PPA-0055-WXH)

Introduction

Molten salt reactor (MSR) is regarded as one of the most promising candidates as the next generation nuclear plant project, and the interest to the MSR has been renewed recently. The heat generated in the reactor core is transferred by the molten salt for industrial applications. As heat storage and transfer media applied in MSR, molten salt must satisfy a number of requirements, such as low neutron capture section, chemical stability at high temperature (>1073 K) and intense radiation, low melting temperature and high boiling temperature, large specific heat capacity and thermal conductivity, low viscosity and vapor pressure. Molten fluorides can satisfy all above requirements and have been used in the aircraft reactor experiment (ARE) and the molten salt reactor experiment (MSRE) since 1950s.




Principle

The laser flash analysis or laser flash method is used to measure thermal diffusivity of a variety of different materials. An energy pulse heats one side of a plane-parallel sample and the resulting time dependent temperature rise on the backside due to the energy input is detected. The higher the thermal diffusivity of the sample, the faster the energy reaches the backside.

Applications

Used to measure thermal diffusivity of a variety of different materials.

Procedure

The front surface of a plane-parallel sample is heated by a light pulse and the resulting temperature rise at the sample’s rear face is recorded as a function of time. The higher the thermal diffusivity, the faster the temperature rise reaches the rear face.

Materials

Light/Laser Flash Analyzers