Graduate Thesis Or Dissertation
 

Predicting Thermal Conductivity in Nuclear Fuels using Rattlesnake-Based Deterministic Phonon Transport Simulations

Público Deposited

Conteúdo disponível para baixar

Baixar PDF
https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mw22v804z

Descriptions

Attribute NameValues
Creator
Abstract
  • The Boltzmann transport equation derived in the Self-Adjoint Angular Flux (SAAF) formulation is applied to simulate phonon transport. The neutron transport code Rattlesnake is leveraged in this fashion, slightly modi ed to accept input from variables consistent with phonon transport simulations. Several benchmark problems are modeled to assess the potential of this application to predict thermal conductivity in materials with heterogeneity and isotopic fission products affecting thermal transport. The 1-D, SAAF formulation of the Boltzmann transport equation for phonons is derived along with associated boundary conditions. Comparisons to phonon transport problems solved via deterministic, Monte Carlo (MC) and molecular dynamics (MD) methods are shown. Phonon intensity and heat flux are used to compute thermal conductivity in materials. Phonon transport with Rattlesnake using similar input conditions compares well to test problems in open literature. Transport is simulated in one and two element systems, with special emphasis on uranium dioxide (UO₂) with xenon cluster defects. Rattlesnake solutions show thermal conductivity in UO₂ decreasing by up to a factor of 4 at elevated temperatures. Transport behavior for these problems appears qualitatively correct, though lack of data for xenon properties yields results which deviate from MD simulations. Results are generally favorable, though the current deterministic phonon transport implementation does not include certain phonon scattering physics. Further development of Rattlesnake is discussed, with an emphasis on coupling with phase fields for better characterization of microstructure in nuclear fuel.
License
Resource Type
Date Available
Date Issued
Degree Level
Degree Name
Degree Field
Degree Grantor
Commencement Year
Advisor
Committee Member
Academic Affiliation
Non-Academic Affiliation
Subject
Declaração de direitos
Publisher
Peer Reviewed
Language
Replaces

Relações

Parents:

This work has no parents.

Em Collection:

Itens

Miniatura Título Data de carga Acesso Ações
file details HarterJacksonR2016.pdf 2017-08-07 Público Baixar