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URI permanente para esta coleçãohttps://repositorio.fei.edu.br/handle/FEI/5123
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Artigo de evento 1 Citação(ões) na Scopus Thermal performance and pressure drop in a ceramic heat exchanger evaluated using CFD simulations(2011-07-07) MONTEIRO, D. B.; Paulo de MelloThere is one potential demand for heat exchangers capable of supporting high temperatures, typically higher than 800°C, for use in thermal power plants. These heat exchangers could be used in the implementation of EFGT (Externally Fired Gas Turbines) cycles. To support these working conditions the heat exchanger must be constructed with ceramics. This work presents the results obtained with CFD simulations of one plate-fin ceramic heat exchanger. Correlations for the Colburn and friction factors, for a range of Reynolds number between 500 and 1500, are evaluated from the numerical results obtained with CFD. These correlations may be used for the thermal design of ceramic heat exchangers. One validation procedure is conducted comparing the simulation results with experimental data for a compact heat exchanger of similar configuration.Artigo de evento 7 Citação(ões) na Scopus Thermodynamic study of an EFGT (Externally Fired Gas Turbine) cycle with one detailed model for the ceramic heat exchanger(2011-07-07) Paulo de Mello; MONTEIRO, D. B.The EFGT cycle has been considered as an option to burn biomass in gas turbines. One key element on the implementation of one EFGT cycle is the ceramic heat exchanger necessary to support the high temperatures of operation. The performance of the ceramic heat exchanger, its effectiveness and pressure drop imposed to the gas flow, may have significant influence over the thermal efficiency of the EFGT cycle. The simulations of the EFGT cycle presented herein use correlations for the pressure drop and heat transfer of one ceramic heat exchanger of the plate and fin type, evaluated numerically. The results obtained show that the type of ceramic heat exchanger simulated presents adequate performance to be implemented in one EFGT cycle.Artigo de evento 0 Citação(ões) na Scopus Heat transfer and pressure drop correlations for finned plate ceramic heat exchangers(2014-06-15) VILLANUEVA, H. H. S.; Paulo de MelloThe use of ceramic materials is a good option to build heat exchangers for high temperature applications when cost is a concern. This work presents heat transfer and pressure drop correlations for one finned plate heat exchanger evaluated using CFD simulations. One adequate turbulence model was used to include transitional Reynolds number range. The influence of geometrical parameters is included into the correlations, following the same approach commonly used for offset strip fins heat exchangers. For validation purposes, the CFD results are compared to experiments for one particular geometrical configuration. The resultant correlations for the high temperature heat exchanger could be used for optimization purposes, considering possible applications. Analysis of simulation results revealed significant heat transfer enhancement produced by a horseshoe vortex formed in the frontal part of the fins.