Comparative analysis of single and two-phase models for CFD studies of nanofluid heat transfer

CFD predictions of laminar mixed convection of Al 2O 3–water nanofluids by single-phase and three different two-phase models (volume of fluid, mixture, Eulerian) are compared. The elliptical, coupled, steady-state, three-dimensional governing partial differential equations for laminar mixed convecti...

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Bibliographic Details
Published in:International journal of thermal sciences 2011-08, Vol.50 (8), p.1343-1354
Main Authors: Akbari, M., Galanis, N., Behzadmehr, A.
Format: Article
Language:English
Subjects:
Applied sciences
CFD
Chemistry
Colloidal state and disperse state
Computational fluid dynamics
Computational methods in fluid dynamics
Condensed matter: structure, mechanical and thermal properties
Convection modes
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Fluid dynamics
Fluid flow
Fundamental areas of phenomenology (including applications)
General and physical chemistry
Heat transfer
Laminar
Mathematical models
Mixed convection
Nanocomposites
Nanofluids
Nanomaterials
Nanostructure
Physical and chemical studies. Granulometry. Electrokinetic phenomena
Physics
Single-phase model
Theoretical studies. Data and constants. Metering
Thermal properties of condensed matter
Thermal properties of small particles, nanocrystals, nanotubes
Two-phase models
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Summary:CFD predictions of laminar mixed convection of Al 2O 3–water nanofluids by single-phase and three different two-phase models (volume of fluid, mixture, Eulerian) are compared. The elliptical, coupled, steady-state, three-dimensional governing partial differential equations for laminar mixed convection in a horizontal tube with uniform heat flux are solved numerically using the finite volume approach. It is found that single-phase and two-phase models predict almost identical hydrodynamic fields but very different thermal ones. The predictions by the three two-phase models are essentially the same. For the problem under consideration the two-phase models give closer predictions of the convective heat transfer coefficient to the experimental data than the single-phase model; nevertheless, the two-phase models over-predict the enhancement of the convective heat transfer coefficient resulting from the increase of the alumina volume fraction. The results are calculated for two Reynolds numbers (1050 and 1600) and three nanoparticle volume concentrations (
ISSN:1290-0729
1778-4166
DOI:10.1016/j.ijthermalsci.2011.03.008