Library Subscription: Guest
Home Archives Officers Future meetings American Society of Thermal and Fluids Engineering
Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

NUMERICAL INVESTIGATION ON THE TURBULENT CONVECTIVE HEAT TRANSFER OF NANOFLUID FLOWS IN AN UNIFORMALY HEATED PIPE

Ghofrane Sekrani
Mechanical Engineering Department, Université de Sherbrooke 2500 boulevard de l'Université, Sherbrooke (QC), J1K 2R1, Canada

S. Poncet
Mechanical Engineering Department, Université de Sherbrooke 2500 boulevard de l'Université, Sherbrooke (QC), J1K 2R1, Canada

Abstract

Turbulent convective heat transfers of Al2O3-water nanofluid flowing in a circular tube subjected to a uniform and constant wall heat flux are numerically investigated using different turbulence models. Three nanoparticle volume concentrations, namely φ=0.02, 0.1 and 0.5% are considered for different bulk Reynolds numbers within the range 3000<Re<20 000. The effects of the nanoparticle concentration and the Reynolds number on the convective heat transfer and friction factor are reported. Two different numerical approaches including the single-phase and the mixture two-phase models with variable thermophysical properties are favorably compared to experimental results obtained from the literature. Adding nanoparticles to the base fluid was found to significantly improve the average heat transfer coefficient. The Nusselt number increases with increased nanoparticle volume concentration and increased Reynolds number, whereas the friction factor decreases with increased Reynolds number. Seven turbulence models in their low-Reynolds number formulation were also compared to assess their ability to predict the effect of turbulence on the convective heat transfer. The SST k-ω model was found to perform the best with errors in terms of the average Nusselt number and friction coefficient of 0.44% and 1.82% respectively. On the contrary, the Reynolds Stress Model completely failed to provide the good values with discrepancies of 41.91% and 133.54%, respectively.

Purchase $20.00 Check subscription Publication Ethics and Malpractice Recommend to my Librarian Bookmark this Page