Speaker
Youngmin Lee
(NFRI)
Description
The property of functional material for the design of the breeding blanket is very essential. Since the stress due to the thermal load on breeding blanket structure is one of the main design driver, the thermal property of the material is very important for thermal-structural and thermo-hydraulic analysis. In particular, the thermal conductivity is one of necessary input data for these analyses performed in order to understand the heat transfer phenomena and estimate the thermal stress. Since for the functional materials of solid type breeding blanket a pebble-bed form is mainly adopted instead of a bulk form such as a block or a disk, it should be needed to measure the thermal conductivity of pebble-bed. In this study, the effective thermal conductivity of pebble-bed is measured by laser flash method, which is one of the various thermal conductivity measurement methods, because this method has several advantages such as a wide thermal conductivity range of the measurement and a small amount of pebbles. A sample holder considering the heat transfer mechanism from the laser source to pebble-bed has been specially designed in order to apply the laser flash technique to the pebble-bed sample and it has been validated by the experiments. This paper introduces preliminary results of the effective thermal conductivity on the pebble-bed using this sample holder.
Co-authors
Duck Young Ku
(NFRI, Daejeon, South Korea)
Mu-Young Ahn
(NFRI, Daejeon, South Korea)
Seungyon Cho
(NFRI, Daejeon, South Korea)
Yi-Hyun Park
(NFRI, Daejeon, South Korea)
Youngmin Lee
(NFRI, Daejeon, South Korea)
