Abstract
UO2/BeO interfacial thermal resistance (ITR) is calculated by diffuse mismatch model (DMM), and the effects of ITR on UO2-BeO thermal conductivity are investigated. DMM can predict UO2/dispersed-BeO ITR within the accuracy of orders of magnitude. However, UO2/continuous-BeO ITR is three to four orders of magnitude larger than DMM predictions. This indicates that UO2/dispersed-BeO ITR is mainly induced by the vibrational mismatch, while UO2/continuous-BeO ITR may be attributed to the contact resistance. The thermal conductivity of UO2 containing dispersed BeO decreases with the decrease in BeO size, and the thermal conductivity of UO2 containing continuous BeO decreases with the decrease in the size of UO2 granule surrounded by BeO. The conditions for achieving the targeted enhancement of UO2 thermal conductivity by doping with BeO are derived. These conditions can be used to design and optimize the distribution, content, size of BeO, and the size of UO2 granule.
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