Performance Evaluation Of Nano-Coolant Multi-Walled Nanotube (MWNT) Particles In Ethylene Glycol

Muhammad Rosli Hidayat, Noor Salim (2015) Performance Evaluation Of Nano-Coolant Multi-Walled Nanotube (MWNT) Particles In Ethylene Glycol. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

This thesis is focused on formulating nanofluid from carbon nanoparticles to improve the performance of ethylene glycol in heat transfer application. This is because the limitation on the amount of heat that can be absorbed by ethylene glycol. This project is carried out with the aim to develop highly efficient nano-coolant produced from the mixture of nanocarbon, commercial coolant and dispersing agent. The project is based on to formulate nanofluid using carbon nanotubes namely functionalized Multi-Walled Carbon Nanotube. These nanofluids are formulated by using various ratios of carbon nanotubes and dispersing agent, namely Polyvinylpyrolidone (PVP). Then, the stability test of the nanofluids was carried out through the experimental processes. The thermal properties of the nanofluids are determined at three different temperatures, which are 6 °C, 25 °C and 40 °C. The thermal properties that need to be determined are thermal conductivity, viscosity, specific heat capacity and heat transfer coefficient. The apparatus used to determine the mentioned properties are KD2-Pro TC analyzer, viscometer and calorimeter bomb. The formulation of nanofluid starts by mixing the carbon nanotube and dispersing agent into ethylene glycol. Then, the mixture needs to be homogenize by using homogenizer machine at 10000 rpm for five minutes. After that, ultrasound machine is used to avoid the particles in nanofluids coagulate by the agglomeration process. Then, the pH value being checked and need to be maintained around 9. If not, the nanofluid needs to be added either sodium hydroxide (NaOH) or nitric acid (HNO3). The nanofluids are then left aside for 100 hours to check its stability. Lastly, the determination of the thermal properties takes place. As a result, NFR01 is chosen as the best sample of nanofluid with enhanced thermal properties and has a relatively low viscosity. This potential nanofluid will be highly used in the industries such as biomedical application, cooling application, energy application and mechanical application.

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