tailieunhanh - Thermal transport in thorium dioxide

In this research paper, the thermal transport in thorium dioxide is investigated by using nonequilibrium molecular dynamics. The thermal conductivity of bulk thorium dioxide was measured to be W/m-K, confirming reported values, and the phonon mean free path was estimated to be between 7 and nm at 300 K. | Nuclear Engineering and Technology 50 2018 731 737 Contents lists available at ScienceDirect Nuclear Engineering and Technology journal homepage locate net Original Article Thermal transport in thorium dioxide Jungkyu Park Eduardo B. Farfan Christian Enriquez Check for updates Kennesaw State University Department of Mechanical Engineering Kennesaw GA 30144 USA ARTICLE INFO ABSTRACT Article history Received 28 September 2017 Received in revised form 20 December 2017 Accepted 12 February 2018 Available online 1 March 2018 In this research paper the thermal transport in thorium dioxide is investigated by using nonequilibrium molecular dynamics. The thermal conductivity of bulk thorium dioxide was measured to be W m-K confirming reported values and the phonon mean free path was estimated to be between 7 and nm at 300 K. It was observed that the thermal conductivity of thorium dioxide shows a strong dependency on temperature the highest thermal conductivity was estimated to be W m-K at 100 K and the lowest thermal conductivity was estimated to be W m-K at 1200 K. In addition by simulating Keywords Molecular Dynamics Simulation Nuclear Fuel Thermal Transport Thorium Dioxide thorium dioxide structures with different lengths at different temperatures it was identified that short wavelength phonons dominate thermal transport in thorium dioxide at high temperatures resulting in decreased intrinsic phonon mean free paths and minimal effect of boundary scattering while long wavelength phonons dominate the thermal transport in thorium dioxide at low temperatures. 2018 Korean Nuclear Society Published by Elsevier Korea LLC. This is an open access article under the CC BY-NC-ND license http licenses by-nc-nd . 1. Introduction The utilization of thorium as a new energy source has been of interest to researchers for several years 1 . Thorium exists in nature as Th-232 and is more abundant than uranium which has been the .