A numerical study of Al2O3 -TiO2 hybrid nanofluid on radiator performance Najmul Hidayat, Dr. Ir. Sudarmadji, M.T.
Politeknik Negeri Malang
Abstract
The development of technology today could produce particle sized nano material for metal or nonmetal materials in industrial scale with relatively cheap price. Fluid coolant like pure water, oil or ethylene glycol engineered to becomes nanofluid with size below 100 nm. Particle nano have unique thermal, mechanical, optical, electrical and magnetic properties. Particle nano in low concentration dispersed and suspended on fluid coolant could raise thermal fluid the many times fold. On developing new correlations for the thermophysical properties of nanofluids and then applying them in numerical modeling to determine heat transfer coefficient and friction loss.
The purpose of this study was to compare the results of CFD to tests on the effect of concentration, discharge and inlet temperature of Hybrid Nanofluid Al2O3 TiO2 to temperature distribution, pressure and radiator performance. The method used in this research is CFD simulation. The data taken in this study is the rate of heat transfer in the cooling fluid of pure radiator coolant and radiator coolant plus Al2O3 TiO2 hybrid nanoparticles (hybrid nanofluid radiator coolant) with a mass percentage nanoparticle hybrid mixture of 0.25, 0.30, 0.35 percent. Variations in the amount of fluid flow with a liter/ minute discharge (LPM) of 20, 24,28, and using variations in the amount of radiator fluid inlet temperature (Tin), namely 70, 80, 90 celsius which will be simulated by ANSYS FLUENT software.
The smallest error of outlet temperature CFD simulation to experiment is 0.37 percent at Tin 70 celsius, mass concentration of 0.2 percent at 20 LPM discharge and the highest error is 2.96 percent at Tin 90 celsius pure coolant without nanoparticle with a discharge of 28 LPM. Minimum error of overall heat transfer coefficient is -0.39 percent Tin 70 celsius, mass concentration 0.25 percent at 20 LPM discharge and maximum error is -2.45 percen at Tin 90 celsius, pure coolant without nano particle with a discharge of 28 LPM.
