A Comparative Study On Stability And Thermal Properties Of Various Nanofluids

The attention of researches in convective heat transfer by suspended nanoparticles base fluids has grown lately to promote uncommon techniques for enhancing the thermal performance fluids. In this study, stability period and properties aluminium oxide (Al2O3), silicon dioxide (SiO2) Al2O3–SiO2 hybrid were investigated at volume concentration 0.1vol.% dispersed Distilled Water (DW) as a fluid. For nanofluid, samples consisted  (0.025 vol.%Al2O3+0.075vol.%SiO2),(0.05vol.%Al2O3+0.05vol.%SiO2)and(0.075vol.%Al2O3+0.025vol.%SiO2). two-step method was adopted prepare nanofluid using Ultrasonic device. Three different ultrasonication times fitted preparing (1hr,2 hr 3 hr).The single nanofluids evaluated various temperatures (from 30 °C 70 °C). obtained results demonstrated that dispersion homogeneous more stable longer all prepared process. Among nanofluids, SiO2/DW found be most coolant. with an increase temperature, conductivity specific increased significantly while density viscosity decreased.