Estudo experimental e modelo matemático sobre ebulição em vaso para água destilada e nanofluido de grafeno

• Ano de defesa: 2016
• Autor(a) principal: Eder Cesar Dias
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Minas Gerais; UFMG
• Palavras-chave em Português: Ebulição em vaso; Nanofluido de grafeno; Modelo; Engenharia mecânica
• Link de acesso: http://hdl.handle.net/1843/BUBD-ABYNLA

The study of different fluids to be used in boilers and pressure vessel is a worldwide trend. Among the different fluids investigated, one class stands, i.e. nanofluids. These fluids are resulting from homogeneous dispersion of nanoparticle into fluids, e.g. water. This research focused on design, manufacturing and testing of a bench device which employed a carbon based nanoparticle (Multi-layer graphene) water nanofluido. The main goal was to measuring the boiling nucleation curve and the heat transfer coefficient by boiling. The heat transfer model was developed to predict the temperature profile and heat flux in the system.The model was developed using the EES software (Engineering Equation Solver) and five different heat transfer correlations were employed to estimate the heat flux and the system temperature profile. Based on data obtained from the tests, it was possible to evaluate theboiling curve and the heat transfer coefficient of system, as well as the model accuracy. It was observed that the Forster-Zuber correlation proved to be more accurate. Nanofluids were obtained with a mass concentration of 0,125%, 0,250%, 0,5% and 1% of graphene nanoparticles dispersed in the distillated water. The use of nanofluids resulted in values of heat flux from 7% to 19% higher than of the pure water. The mass concentration of 0.5% was the most effective among the configurations to get higher heat transfer, resulting in values forheat transfer coefficient from 2 to 10% higher compared to pure water.