Abstract
This paper presents an investigation into the performance characteristics of CuO-TiO2 /transformer-Oil hybrid nanofluid flowing in a radiator. This experimental work set out to investigate the thermal properties of TiO2+CuO/nano-oil at volume concentrations of 0.004%, 0.008% and 0.012%, temperature range of 30 °C to 70 °C and flowrates of 0.2LMP, 0.3LPM, 0.4LPM, 0.5LPM and 0.6LPM. The two step method was employed in the nano-oil preparation. The base fluid is the transformer-oil. The measurements were taken within range, and a flowrate of 0.2 to 0.6 L/min with the cooling air velocity of 0.0002 m/s. Based on the experimental results, the thermal-conductivity of nanofluid investigated increased with percentage concentration of nanoparticles. Dynamic-viscosity increases with percentage increase in nanoparticles. The overall Heat Transfer Coefficient (HTC) decreases as temperature of the nanofluid increased. The higher the nanofluid flowrate the steeper the curve, indicating that the HTC increases with flowrate. Nanofluid HTC decreases as the percentage volume concentration of nanoparticle concentration increased. Specific heat capacity and thermal-conductivity increased as percentage volume of nanoparticle increased.
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