Effective thermal conductivity measurement of the candidate ceramic breeder pebble beds by the hot wire method

摘要

The effective thermal conductivity of the pebble beds is one the most important design parameters for pebble bed solid breeder blanket. In the framework of IEA Implementing Agreement on Solid Breeder Subtask Group, measurement of pebble bed thermal conductivity by the hot wire method were defined as one of tasks to provide comparative information on the effective thermal conductivity of candidate ceramic pebble beds for DEMO blanket designs and ITER breeding blanket design. The a uthors previously reported the pre-liminary result of the pebble bed thermal conductivity for Li_(2O), Be and Al_2O_3. This paper presents the result of Li_2TiO_3, Li_2ZrO_3 (1 mm diameter) from CEA, and Li_4SiO_4 (0.25 - 0.63 mm diameter) from FZK.