Thermo-Hydraulic Performance Analyses of Water Based TiO2-SiO2 Hybrid Nanofluid Flow in a Horizontal Tube

摘要

This study presents a numerical investigation of effect of hybrid TiO2-SiO2 nanofluid on thermo hydraulic performance. In the numericalanalysis, in order to ensure fully developed flow, the tested tube was adjusted, and uniform heat flux was applied on the outer surface of thetest tube. Different turbulence models were examined and k-ω Shear Stress Transport (SST) turbulent model was employed to simulate turbulentflow, and analyses were implemented for Reynolds number ranging from 10,000 to 50,000. The flow was assumed as mixture phase, andproperties of nanoparticles and water are assumed as not depends on temperature. Thermo-physical properties of nanofluid were calculatedfrom commonly used correlations in literature. Nanofluid volume fractions in base water were employed as 5, 4, 3, and 2% in which eachfraction has different volume fractions of TiO2 and SiO2. As a result, the higher volume fraction of SiO2 compared to TiO2, the higherthermo-hydraulic performance was obtained.