Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Computational Simulation of Turbulent Flow and Heat Transfer of Supercritical CO2 in a Micro Modular Reactor (MMR) Subchannel
Submission Author:
Carolina da Silva Bourdot Dutra , RJ , Brazil
Co-Authors:
Carolina da Silva Bourdot Dutra, Felipe Porto Ribeiro, Su Jian
Presenter: Carolina da Silva Bourdot Dutra
doi://10.26678/ABCM.ENCIT2018.CIT18-0355
Abstract
In this work we present and analyze the steady-state hydraulic behavior of the supercritical CO2 through of the computational modeling of the triangular arrayed rod bundle subchannel of the KAIST (Korea Advanced Institute of Science and Technology) MMR. The mathematical model was composed of the Reynolds--averaged Navier--Stokes equations (RANS), with the k-omega SST (Shear Stress Transport) turbulence model for the coolant fluid in the subchannel and the heat conduction equation for the fuel and cladding. The thermodynamic properties of CO2 were implemented from National Institute of Standards and Technology (NIST) data. The transport equations were solved using a commercial CFD (Computational Fluid Dynamics) tool, ANSYS Fluent. Initially, a geometric model was constructed, using the ICEM software, composed of fuel, gap, cladding, coolant and two adiabatic regions of the fuel rod. The numerical solution used was validated by simulating a simpler vertical circular tube and comparing with numerical and experimental results available in the literature. Using these results, we performed the mesh sensitivity study and initialized the study of the flow in the subchannel. Afterwards, the mass flow rate was decreased to analyze the behavior friction factor and the Nusselt number as a function of the Reynolds number.
Keywords
Micro Modular Reactor, CFD (Computational fluid dynamics), Supercritical CO2
