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Tesi etd-01112019-161805


Thesis type
Tesi di laurea magistrale
Author
BUZZI, FULVIO PAOLO
URN
etd-01112019-161805
Title
Computational analysis of heat transfer to fluids at supercritical pressure in support to the design of Generation IV nuclear reactors
Struttura
INGEGNERIA DELL'ENERGIA, DEI SISTEMI, DEL TERRITORIO E DELLE COSTRUZIONI
Corso di studi
INGEGNERIA ENERGETICA
Commissione
relatore Prof. Ambrosini, Walter
relatore Dott. Pucciarelli, Andrea
Parole chiave
  • CFD
  • Deteriorated Heat Transfer
  • Supercritical Fluids
  • SCWRs
Data inizio appello
28/02/2019;
Consultabilità
completa
Riassunto analitico
Heat transfer to supercritical fluids has been studied in several past decades, though satisfactory models are not yet available especially for deteriorated heat transfer phenomena. The present study, performed in the frame of researches in support to the design of Generation IV Supercritical Water Cooled Nuclear Reactors (SCWRs), analyses heat transfer data with carbon dioxide at pressure higher than the critical one using a CFD code. It must be noted that carbon dioxide is often used as a fluid replacing water in laboratory experiments, showing similar phenomena at lower operating pressures and temperatures. The purpose of the work is to carry out a detailed validation of a previously adopted turbulence model in order to highlight its capabilities and limitations. After a thorough assessment of the model, possible improvements are tried in order to compensate for observed deficiencies, obtaining results that are in better agreement with experimental data.
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