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13th Spring School on Transition and Turbulence
Numerical-Experimental Analysis of Plate-Finned Heat Exchanger with Different Fin Geometry: Influence of Thermal Contact and Turbulence Promoters in Nusselt Number
Willian Kévin Rauber , Santa Catarina , Brazil
Co-Authors: Julia Marchioro, José Victor Romero Durando, Willian Kévin Rauber, Miguel Vaz Jr., Marcus Vinícius Canhoto Alves, Paulo Zdanski
Presenter: Julia Marchioro
The present work discusses the effects of delta winglet vortex generators and thermal grease on a heat exchanger with perforated plate fins based on a hybrid numerical-experimental analysis. This study compares the heat transfer rate for the same system with and without the addition of the vortex generators and thermal grease on the thermal contact between tubes and fins. The system is composed of four heaters connected by three perforated plate fins, made of aluminum. The hybrid methodology used in this paper consists of experiments performed on a wind tunnel, from which the boundary conditions for the numerical simulations were obtained. The commercial program Ansys-Fluent® was adopted so solve the governing and turbulence equations. The methodology is validated through comparisons with results from literature. The main results indicate an increase of the Nusselt number close to 26% when vortex generators are used, and an average of 12% when thermal grease is used to improve the contact between tubes and fin.
Finned-tube heat exchangers, Wind Tunnel, Hybrid methodology, Vortex generators, Nusselt number