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ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Heat Transfer Analysis of a Supercritical Carbon Dioxide Natural Circulation Loop
Submission Author:
Gabriel Caetano Gomes Ribeiro da Silva , RJ
Co-Authors:
Gabriel Caetano Gomes Ribeiro da Silva, Su Jian
Presenter: Gabriel Caetano Gomes Ribeiro da Silva
doi://10.26678/ABCM.ENCIT2018.CIT18-0723
Abstract
Considering the advantages of employing supercritical fluids in the industry and the importance of passive cooling systems, specially in the nuclear sector, it is important to understand the thermalhydraulic behavior of a supercritical flow, whose properties vary sharply causing several implications in terms of project. A 3D stationary model was implemented in ANSYS Fluent to investigate the heat transfer deterioration threshold within a supercritical carbon dioxide natural circulation loop, as well as heat transfer performance based on relations between dimensionless numbers. The mass flow rate increased, as expected, with the heater power input increment until a maximum was reached and experienced a sudden decline afterwards, characterizing the beginning of the heat transfer deterioration regime. In addition, a correlation for Nusselt number as a function of Rayleigh was proposed for the system under regular heat transfer regime, that is before the advent of heat transfer deterioration regime.
Keywords
Heat transfer, natural circulation, CFD, Supercritical fluid, CO2
