Publication de 8 numéros par an
ISSN Imprimer: 1065-5131
ISSN En ligne: 1563-5074
Indexed in
EXPERIMENTAL INVESTIGATIONS ON THE COOLING PERFORMANCE OF MICROCHANNELS USING ALUMINA NANOFLUIDS WITH DIFFERENT BASE FLUIDS
RÉSUMÉ
The cooling performance of a microchannel heat sink is experimentally examined with nanofluids as coolants. The heat sink, with 21 parallel microchannels, was fabricated on an aluminum substrate with a hydraulic diameter of 444 μm and aspect ratio of 8. The microchannels were fabricated using an electric discharge machine, and further fluid flow was through the inlet and outlet manifolds of the test section. The present work used alumina nanofluids, which were prepared using a two step method by dispersing the alumina nanoparticles into the base fluids at different nanoparticle concentrations of 0.1–1 vol.%. Different base fluids such as water (W) and water/ethylene glycol (W/EG) mixtures in the ratios of 90:10, 80:20, 70:30, 60:40, and 50:50 were used in this work to make a clear comparison of the effect of the base fluids in the microchannels. To study the heat transfer and fluid flow characteristics different flow rates for the nanofluids were used, ranging from 0.2 to 2 ml/min. An increase in the flow rate as well as the nanoparticle concentration caused an in the heat transfer coefficient, which in turn improved the heat transfer performance. The heat transfer coefficient increased from 6.2% to 36.5% with the base fluid variation from W to W/EG (50:50). The experimental results showed higher improvements in the thermal performance by using nanofluids with W/EG (50:50) base fluids. Moreover, the pumping power required for the flow of the nanofluids was also very low due to the minimal effect of viscosity and density, which confirmed the negligible effect on the thermal systems since heat transfer performance was comparatively very high.
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