GABRIEL ANGELO
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Artigo IPEN-doc 24790 A CFD analysis of the flow dynamics of a directly-operated safety relief valve2018 - SCURO, N.L.; ANGELO, E.; ANGELO, G.; ANDRADE, D.A.A three-dimensional numerical study on steady state was designed for a safety relief valve using several openings and inlet pressures. The ANSYS-CFX (R) commercial code was used as a CFD tool to obtain several properties using dry saturated steam revised by IAPWS-IF97. Mass flow and discharge coefficient calculated from simulations are compared to the ASME 2011a Section 1 standard. The model presented constant behavior for opening lifts smaller than 12mm and is very reasonable when compared to the standard (ASME). In addition, the conventional procedure to design normal disc force assumes that all the fluid mechanical energy was converted into work; however, the CFD simulations showed that average normal disc force is about 19% lower than theoretical ASME force, which could prevent the valve oversizing. A numerical validation was conducted for a transonic air flow through a converging-diverging diffuser geometry to verify the solver's ability to capture the position and intensity of a shockwave: the results showed good agreement with the benchmark experiments.Artigo IPEN-doc 18039 A mathematical model for metastable condition determination of highly flashing liquid flows through expansion devices2012 - ANGELO, E.; ANGELO, G.; ANDRADE, D.A.Artigo IPEN-doc 18093 A numerical and three-dimensional analysis of steady state rectangular natural circulation loop2012 - ANGELO, G.; ANDRADE, D.A.; ANGELO, E.; TORRES, W.M.; SABUNDJIAN, G.; MACEDO, L.A.; SILVA, A.F.Free convection circuits or natural circulation systems are employed in several engineering fields. In nuclear reactors, natural circulation can be used as a passive safety system or as a main heat transfer mechanism. This work presents the results of a three-dimensional numerical analysis of a steady state rectangular natural circulation loop located at the Instituto de Pesquisas Energéticas e Nucleares/Comissão Nacional de Energia Nuclear (IPEN/CNEN-SP). Numerical results and experimental data present in this paper are discussed and compared. The model is good enough to capture 3-D effects, such as the formation of vortex structures and swirl effects.