Numerical study of two phase laminar mixed convection nanofluid in elliptic ducts

Mohammad Shariat (1) , Alireza Akbarinia (2) , Alireza Hossein Nezhad (1) , Rainer Laur (2)

1 Department of Mechanical Engineering
2 University of Bremen

Laminar mixed convection -Water nanofluid flow in elliptic ducts with constant heat flux boundary condition has been simulated employing two phase mixture model. Three-dimensional Navier-Stokes, energy and volume fraction equations have been discretized using the finite volume method. The Brownian motions of nanoparticles have been considered to determine the thermal conductivity and dynamic viscosity of -Water nanofluid, which depend on temperature. Simulation effects of solid volume fraction, aspect ratio and buoyancy forced on thermal and hydraulics behaviors of nanofluid flow in elliptic ducts have been presented and discussed. The calculated results show good agreement with the previous numerical data. Results show that in a given Reynolds number (Re) and Richardson number (Ri), increasing solid nanoparticles volume fraction increases the Nusselt number (Nu) while the skin friction factor decreases. Increasing aspect ratio (=) in elliptic tubes reduces the local skin friction factor whereas it does not have any specified effect on the local Nusselt number.

Mots clés: Nanofluid; Mixed Convection; Two Phase; Elliptic Duct; Mixture Model

Domaines: Thermique [physics.class-ph]; Thermique [physics.class-ph]

Mohammad Shariat, Alireza Akbarinia, Alireza Hossein Nezhad, Rainer Laur. Numerical study of two phase laminar mixed convection nanofluid in elliptic ducts. Applied Thermal Engineering, 2011, 31 (14-15), pp.2348. ⟨10.1016/j.applthermaleng.2011.03.035⟩. ⟨hal-00781347⟩