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

Detalhes bibliográficos
Ano de defesa: 2016
Autor(a) principal: Eder Cesar Dias
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Universidade Federal de Minas Gerais
UFMG
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://hdl.handle.net/1843/BUBD-ABYNLA
Resumo: 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.