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COBEM 2019
25th International Congress of Mechanical Engineering
THERMAL PERFORMANCE OF SILVER WATER/EG NANOFLUIDS IN RECTANGULAR CROSS SECTION MICROCHANNELS HEAT SINK
Submission Author:
ENIO PEDONE BANDARRA FILHO , MG , Brazil
Co-Authors:
Elena Peñaranda, Ítalo Guilherme, ENIO PEDONE BANDARRA FILHO, Carolina Palma Naveira Cotta
Presenter: Ítalo Guilherme
doi://10.26678/ABCM.COBEM2019.COB2019-2455
Abstract
In this paper the thermal performance of silver nanofluid used as a coolant into a rectangular cross section microchannel heat sink is analyzed by evaluating the convective heat transfer coefficient and the thermal resistance of the fluids. For the synthetizing process of the nanofluid it was used silver nanoparticles powder with diameter of 80 nm. The based fluid is composed by 50% of distilled water and 50% of ethylene glycol. The solution is diluted using the ultrasonic disrupt method, resulting in a nanofluid with volume concentrations of 0.0005%, 0.001% and 0.005%. The thermophysical properties such as thermal conductivity and viscosity of the samples were experimentally measured. Then, the nanofluids were test in an experimental facility under different mass flow, heat flux and inlet fluid temperature conditions. From the experimental results, there was not observed significate differences between the viscosity of nanofluids and the base fluid. However, it was obtained enhancements in the thermal conductivity related to the volume concentration of nanoparticle. A maximum enhancement of in the convective heat transfer coefficient of the heatsink 44.8%, and in the thermal resistance of 21.7% was observed for the highest concentration nanofluid.
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