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

The effective thermal conductivity of the pebble beds is one the most impor tant design parameters for pebble bed solid breeder blanket. In the framewo rk of IEA Implementing Agreement on Solid Breeder Subtask Group, measuremen t of pebble bed thermal conductivity by the hot wire method were defined as one of tasks to provide comparative information on the effective thermal c onductivity of candidate ceramic pebble beds for DEMO blanket designs and I TER breeding blanket design. The authors previously reported the preliminar y result of the pebble bed thermal conductivity for Li2O, Be and Al2O3. Thi s paper presents the result of Li2TiO3, Li2ZrO3 (1 mm diameter) from CEA, a nd Li4SiO4 (0.25 - 0.63 mm diameter) from FZK. Observation was compared to the correlations, SZB model and HM model. Conta ct area fraction was obtained by correlation fitting, of which the value is 4.9x10(-3) for Li2TiO3, Li2ZrO3 (the same value as Li2O) and 1x10(-6) for and Li4SiO4.