UO2/BeO interfacial thermal resistance and its effect on fuel thermal conductivity

UO2/BeO interfacial thermal resistance (ITR) is calculated by diffuse mismatch model (DMM) and the effects of ITR on UO2-BeO conductivity are investigated. predicted DMM order 10-9 m2K/W. Using this ITR, conductivities theoretical models compared with experimental data. The results indicate that prediction applicable to interface between UO2 dispersed BeO, while not continuous BeO. If containing BeO was be in agreement data, its should 10-6 - 10-5 Therefore, vibrational considered major mechanism for attenuating heat flux through UO2/dispersed-BeO interface, but UO2/continuous-BeO interface. Furthermore, it found presence leads dependence size. With decrease size, decreases. When size smaller than a critical value, becomes even conductivity. For decreases granule surrounded necessarily Under temperature, always larger Above only when large enough. conditions achieving targeted enhancement doping derived. These can used design optimize distribution, content, granule.