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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EXPERIMENTAL AND NUMERICAL STUDY OF A MICRO HEAT EXCHANGER
Submission Author:
Bruna Gomes , RS
Co-Authors:
Bruna Gomes, Jacqueline Copetti
Presenter: Bruna Gomes
doi://10.26678/ABCM.COBEM2017.COB17-0752
Abstract
In this study, single phase flow in microchannels is experimentally and numerically performed. The study is directed to the analysis of the heat transfer in a micro exchanger of heat developed for the single-phase flow of liquid (water). The manufacture of the aluminum heat exchanger occurred by machining. The geometry of the 8 channels of the heat exchanger is rectangular, with an average hydraulic diameter of 426 μm. An experimental bench was set up for the analysis of the thermal and flow parameters in the exchanger. The temperature distribution in the device, flow regime and local and medium heat transfer coefficient were analyzed for different conditions of heat flux and mass flux. The variation of the mass flux provides lower surface temperatures, the difference between the temperature for a maximum mass flux of 3514kg / m² and the minimum of 706kg / m² is 30.68ºC. The experimental results were compared with a numerical analysis and differences in temperature up to 7 ° C from the numerical over the experimental were verified. The Reynolds number increases with the heat flux and the mass flux. The values of average heat transfer coefficient obtained ranged from 5 to 20 kW / m²K for Re from 300 to 1100.
Keywords
micro-heat exchanger, single phase flow in microchannels, heat transfer through microchannels
