Speaker
Eugenio Vallone
(Dipartimento di Energia)
Description
In the framework of the work package "Divertor" of the EUROfusion action, a research campaign has been jointly carried out for the subproject "Cassette design and integration" by ENEA and University of Palermo to investigate the thermal-hydraulic performance of the DEMO divertor cassette body cooling system. A comparative evaluation study has been performed considering the different options of divertor cassette body coolant and namely pressurized water and helium.
The research activity has been carried out following a theoretical-computational approach based on the finite volume method and adopting a qualified Computational Fluid-Dynamic (CFD) code.
A realistic finite volume model of the cassette body cooling circuit has been set-up and a sensitivity analysis has been carried out in order to select a mesh fine enough to give stable predictions without inducing too long calculation times. The k-e turbulence model, typically suggested for general purpose simulations and offering a good compromise in terms of accuracy and robustness, has been adopted for the calculations and the automatic scalable wall functions have been used to simulate the near-to-wall region flow.
CFD analyses have been carried out for the considered options of cassette body cooling circuit under nominal steady state conditions and their thermal-hydraulic performances have been assessed in terms of overall coolant thermal rise, coolant total pressure drop, flow velocity, pumping power and wall heat transfer distribution at the fluid-structure interface, to check whether they comply with the corresponding limits or to give them in input for the numerical assessment of the cassette body thermo-mechanical performances.
Results obtained are reported and critically discussed.
Co-authors
Eugenio Vallone
(Dipartimento di Energia, Ingegneria dell'Informazione e Modelli Matematici, University of Palermo, Palermo, Italy)
Giuseppe Mazzone
(Unità Tecnica Fusione- ENEA C.R. Frascati, Via E. Fermi 45, 00044 Frascati (RM), Italy)
Jeong-Ha You
(Max Planck Institute of Plasma Physics (E2M), Boltzmann Str.2, 85748 Garching, Germany)
Pietro Alessandro Di Maio
(Dipartimento di Energia, Ingegneria dell'Informazione e Modelli Matematici, University of Palermo, Palermo, Italy)
Silvia Garitta
(Dipartimento di Energia, Ingegneria dell'Informazione e Modelli Matematici, University of Palermo, Palermo, Italy)
