Numerical Investigation of Turbulent Forced Convection Nanofluids Inside an Annulus
Journal Title: Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie - Year 2015, Vol 22, Issue 2
Abstract
Turbulent forced convection heat transfer of Al2O3-water nanofluid has been studied numerically under uniform heat flux on the inner and outer walls in an annulus with rough tubes. Solid nanoparticles diameter were considered to be 18, 32, and 67 nm. Two-dimensional elliptic governing equations were used and the second-order upstream difference scheme and finite volume method were used for the discretization of governing equations. SIMPLEC algorithm has been established the relationship between pressure and velocity. The results demonstrated that the surface friction coefficient increases both in the inner and outer wall of the heat exchanger by increasing the diameter of nanoparticles. On the other side, the Nusselt number of nanofluid is greater than the base fluid for a given Reynolds number and nanoparticle volume fraction. Also, the Nusselt number decreases in the inner and outer wall with increasing the diameter of nanoparticles.
Authors and Affiliations
Farhad Vahidinia, Mohadeseh Miri, Navid Bozorgan
Keywords
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