Effect of temperature towards electrical conductivities of low concentration of AL2O3 nanofluid in electrically active cooling system

摘要

The cooling of electronic component is seen as important because of its effectiveness in removing heat from the cooling system. Nowadays, the nanofluid coolant mixture is highly recommended because its' thermal and electrical conductivity are much better compared to oil or others coolant mixture to boost the performance characteristic of the electrical appliance. The focus of this report is to analyse and discusses the effect of temperature towards electrical conductivity of low percentage concentration of alumina (AlO) nanofluid for electronic cooling. This report will further investigate the effects from the mixture of ethylene glycol and water use as the base fluid when mix with nano metal. About 99.9% pure AlO and 13nm in size is chosen as the nanoparticles. The desired nanoparticles are dispersed in base fluid of various volume fractions and then sonicated with ultrasonic homogeneizer to ensure a fine dispersion of nanofluids. It shows that the thermal and electrical conductivity affected by the change in percentage volume ratio of ethylene glycol (EG) that is between 0% until 100% ratio of 0.13litre (?) total base fluid volumes. The thermal and electrical conductivity of the samples is also affected by the change of temperature and the volume concentrations. Most of the samples show the highest electrical conductivity increment at 90°C. The highest electrical conductivity for 0.1%, 0.3% and 0.5% concentrations at 60% EG are 6.41μS/cm, 9.53μS/cm and 9.55μS/cm increments respectively meanwhile, most of the samples show the lowest electrical conductivity increment at 30°C. Hence, based on this experiment, we can identify the most suitable nanofluid coolant to be used for electrically active environment of heat transfer.