Tesi etd-05062026-102637
Link copiato negli appunti
Tipo di tesi
Corso Ordinario Secondo Livello
Autore
VENTURINI, DAVIDE
URN
etd-05062026-102637
Titolo
NEWPUT: Development, Verification and Validation of a novel 1D C++ Solver for Heat Pipes
Struttura
Classe Scienze Sperimentali
Corso di studi
INGEGNERIA - INGEGNERIA
Relatori
tutor Prof. FONTANA, MARCO
relatore Prof. STABILE, GIOVANNI
relatore Prof.ssa MANERA, ANNALISA
relatore Dott. PETROV, VICTOR
relatore Prof. STABILE, GIOVANNI
relatore Prof.ssa MANERA, ANNALISA
relatore Dott. PETROV, VICTOR
Parole chiave
- Nuclear
- heat-pipes
- C++
- two-phase
- sodium.
Data inizio appello
12/06/2026;
Disponibilità
parziale
Riassunto analitico
NEWPUT is introduced as a one-dimensional, two-phase, fully implicit finite-volume C++ solver for heat pipe thermal-hydraulics. It is developed as a standalone, modular and coupling-ready platform, inspired by the original THROHPUT solver developed by Dr. Michael L. Hall in 1988. The solver addresses transient and steady-state heat pipe operation by solving eleven coupled equations for eleven unknowns. Its physical model includes area-averaged liquid-vapor Navier-Stokes equations and supports cylindrical geometries with porous wick regions, annular gaps and wick-free sections.
The current implementation includes sodium and lithium thermophysical properties, axial gravity, interfacial mass transfer, capillary pressure, liquid and vapor friction closures, and a vapor sonic speed limiter. At the same time, several phenomena remain outside the present modeling scope, including non-condensable gases, frozen startup, hot shutdown, solid-phase working fluid behavior and radial gravity. The implementation is verified through residual convergence analysis, global conservation balances and the Method of Manufactured Solutions. These procedures demonstrate the local, integral, spatial and temporal consistency of the numerical formulation, including the expected first-order behavior.
The solver is validated against four steady-state sodium heat pipe experiments performed at the MISOH facility of the University of Michigan. The validation, currently limited to outer wall temperature distributions, includes thermocouple and numerical uncertainty estimates and provides an assessment of the present predictive capability of NEWPUT.
The current implementation includes sodium and lithium thermophysical properties, axial gravity, interfacial mass transfer, capillary pressure, liquid and vapor friction closures, and a vapor sonic speed limiter. At the same time, several phenomena remain outside the present modeling scope, including non-condensable gases, frozen startup, hot shutdown, solid-phase working fluid behavior and radial gravity. The implementation is verified through residual convergence analysis, global conservation balances and the Method of Manufactured Solutions. These procedures demonstrate the local, integral, spatial and temporal consistency of the numerical formulation, including the expected first-order behavior.
The solver is validated against four steady-state sodium heat pipe experiments performed at the MISOH facility of the University of Michigan. The validation, currently limited to outer wall temperature distributions, includes thermocouple and numerical uncertainty estimates and provides an assessment of the present predictive capability of NEWPUT.
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