Hydrodynamic and heat transfer study of dispersed fluids with submicron metallic oxide particles

摘要

Turbulent friction and heat transfer behaviors of dispersed fluids (i.e., ultrafine metallic oxide particles suspended in water) in a circular pipe were investigated experimentally. Viscosity measurements were also conducted using a Brookfield rotating viscometer. Two Different metallic oxide particles, γ-alumina (Al_2O_3) and titanium dioxide (TiO_2), with Mean diameters of 13 and 27 nm, respectively were used as suspended particles. The Reynolds and Prandtl numbers varied in the ranges 10~4-10~5 and 6.5-12.3, respectively.