EFFECT OF SURFACTANT CONCENTRATION AND NANOPARTICLES SIZE ON THE HEAT TRANSFER PERFORMANCE OF GNP-MWCNT HYBRID NANOFLUIDS
Keywords:
Hybrid Nanofluid, Graphene, Carbon Nanotube, Heat Transfer, Nanoparticles SizeAbstract
This study investigates the heat transfer performance of hybrid nanofluids composed of different sizes of multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) under distinct concentration of Gum Arabic (GA) surfactant. A tubular heat exchanger was used to assess the heat transfer performance of hybrid nanofluid samples with various combinations of MWCNT lengths (0.5 – 2.0 μm and 10 – 30 μm) with a similar diameter (20–30 nm) and GNP diameters (5 μm and 25 μm) with a similar thickness (6–8 nm), at varying surfactant-to-nanoparticle volumetric ratio of 1:5, 3:5 and 1:1. The study found that the combination of GNP 5 μm and long MWCNT obtained the highest heat transfer coefficient. The finding of the study also shown that the optimal GA-to-nanoparticle volumetric ratio in the GNP-MWCNT nanofluid solution was at 3:5.Downloads
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