Effective thermal conductivity of a compressed LiTiO pebble bed

圧縮荷重を受けたLiTiO微小球充填層の実効熱伝導率測定

谷川 尚; 秦野 歳久; 榎枝 幹男; 秋場 真人

Tanigawa, Hisashi; Hatano, Toshihisa; Enoeda, Mikio; Akiba, Masato

固体増殖ブランケットにおける微小球充填層の熱機械特性を明らかにするため、圧縮荷重下におけるLiTiO充填層の実効熱伝導率を測定した。荷重試験機に熱線法による熱伝導率測定装置を組み込み、温度,雰囲気,機械荷重を制御しつつ、充填層の応力-ひずみ特性と実効熱伝導率とを同時測定した。673973Kの温度範囲において、圧縮変形による実効熱伝導率の増加を明らかにした。また、充填層に加えられた温度や圧縮の履歴によって実効熱伝導率が増加し、その効果が圧縮変形の増加によって理解できることを示した。

In order to elucidate thermo-mechanical behaviour of the blanket with the water-cooled ceramic breeders, the effective thermal conductivity of a compressed LiTiO pebble bed was measured by the hot wire method. The measurement chamber for the thermal conductivity was inserted into a tensile test-apparatus. Under controlled temperature, atmosphere and mechanical loads, the stress-strain property and the effective thermal conductivity of the pebble beds were measured simultaneously. At the temperatures ranging from 673 to 973K, increases of the effective thermal conductivity due to the compressive deformation were confirmed. In addition, it was found that history of the mechanical and thermal loads on the bed affected the thermo-mechanical properties of the pebble bed.