Journal
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
Volume 50, Issue -, Pages 15-24Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.icheatmasstransfer.2013.11.003
Keywords
Nanofluid; Mixed convection; Two phase; Elliptic duct; Mixture model; Laminar flow
Categories
Ask authors/readers for more resources
Laminar mixed convection Al2O3-water nanofluid flow in an elliptic tube has been simulated. Effects of the nanoparticles mean diameter and buoyancy force on the nanofluid flow behaviors in the elliptic tube have been investigated. The two phase mixture model has been employed to consider the solid nanoparticle behaviors in the base fluid (water). Three-dimensional Navier Stokes, energy and volume fraction equations have been discretized using the Finite Volume Method (FVM). A uniform heat flux has been applied at the wall boundary conditions. The Brownian motions of nanoparticles have been considered to determine the thermal conductivity and dynamics viscosity of Al2O3 water nanofluid, which depend on the temperature. Variation of the nanopartides distribution, velocity profiles, friction coefficient and Nusselt number with the nanoparticle Mean diameter and Richardson number have been presented and discussed. The generated secondary flows have a major role on the thermal and hydraulic behaviors of nanofluid flow and the nanoparticle distribution. The secondary flows are affected by both the nanoparticle diameter and buoyancy force. At a given Reynolds and Richardson number, an increase in size of nanoparticles reduces the Nusselt number while it does not have a significant effect on the friction factor. Increasing the Richardson number augments the Nusselt number as well as the friction coefficient. There are non-linear relations between the size of the nanoparticle and the nanofluid flow behaviors. (C) 2013 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available