Experimental Investigation Of Thermal Conductivity, Viscosity, Specific Heat And Heat Transfer Properties Of CNF-Based Nanofluids

Syarifah Norfatin, Syed Idrus (2015) Experimental Investigation Of Thermal Conductivity, Viscosity, Specific Heat And Heat Transfer Properties Of CNF-Based Nanofluids. Project Report. UTeM, Melaka, Malaysia. (Submitted)

Text (24 pages) Experimental Investigation Of Thermal Conductivity, Viscosity, Specific Heat And Heat Transfer Properties Of CNF-Based Nanofluids 24 Pages.pdf - Submitted Version Download (354kB)

Abstract

Nanofluids are combination of nanoparticles and base fluid with/without the presence of chemical substances to obtain a completely stable solution. Nanofluids are one of the potential fluids for heat transfer with an enhanced thermal properties and heat transfer performance to be use especially for cooling purpose. The major problem face in existing coolant is the addition of bigger size solid particles which can cause clogging and lowered the thermal conductivity. This research is proposed to formulate an efficient nanofluid of carbon nanofiber (CNF) in ethylene glycol based and investigate the thermal properties to be used as a better coolant compared to the existing coolant. This research is focusing on synthesizing a stable nanofluid from Pyrograf III HHT24 carbon nanofiber at the ratio of 0.1wt% to 1.0 wt% CNF with the usage of ethylene glycol and the presence of polyvinylpyrrolidone (PVP) as the dispersing agent. The nanofluid undergo process of homogenization at 10000 rpm in 5 minutes and ultrasonication for 60 minutes. The pH of the solution is controlled at 9 throughout the formulation process. Stable samples are tested for thermal conductivity where the best enhancement were observed for sample NFP14 at 6 oC. The viscosity is reduced as the temperature decrease where the value fluctuates with different weight percentage. As for heat transfer test, the best result were shown by sample NFP15 at 6 oC and 25 oC which is 31.16% and 61.54% respectively whereas sample NFP14 shows best enhancement at 40 oC which is 14.93%. Meanwhile, only sample NFP14 experienced increment about 0.794% in specific heat while sample NFP12 and NFP15 undergo reduction about -2.951% and -0.479% respectively as opposed to the based fluid. Overall results shows that all samples show improvement in thermal properties and NFP14 are considered as the best sample.

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