The present study aims to identify effects due to convection heat transfer in a microtube enclosure. Different Reynolds numbers for different types of convection flow of a water- Al2O3 nanofluid in a circular tube subjected to a constant wall temperature was numerically analyzed. The single-phase model was employed to simulate the nanofluid convection, taking into account constant thermophysical properties. Simulations have been carried out for the volumetric fraction of alumina nanoparticles,ϕ = 0–4%. It is found that heat transfer flux for nanofluids is greater than that of the base liquid. Heat transfer enhancement is increasing with the particle volume concentration and Reynolds number. A study on wall shear stress was attempted, too.
Numerical analysis on heat transfer enhancement and wall shear stress of an alumina nanofluid for different forced convection flows
MANCA, Oronzio
2013
Abstract
The present study aims to identify effects due to convection heat transfer in a microtube enclosure. Different Reynolds numbers for different types of convection flow of a water- Al2O3 nanofluid in a circular tube subjected to a constant wall temperature was numerically analyzed. The single-phase model was employed to simulate the nanofluid convection, taking into account constant thermophysical properties. Simulations have been carried out for the volumetric fraction of alumina nanoparticles,ϕ = 0–4%. It is found that heat transfer flux for nanofluids is greater than that of the base liquid. Heat transfer enhancement is increasing with the particle volume concentration and Reynolds number. A study on wall shear stress was attempted, too.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
