M. M. Shahmardan - Mechanical Engineering Department of Shahrood University of Technology, Shahrood, Iran
M. Izadi - Mechanical Engineering Department of Shahrood University of Technology, Shahrood, Iran
M. J. Maghrebi - Mechanical Engineering Department of Shahrood University of Technology, Shahrood, Iran
A. Behzadmehr - Department of Mechanical Engineering, University of Sistan & Baluchestan, Iran

Fully developed laminar mixed convection of a nanofluid consisting of water and Al2O3 in a horizontal annulus has been studied numerically. Threedimensional elliptic governing equations have been used. The nanoparticles volume fraction does not have a direct effect on the dimensionless temperature and convective friction coefficient. Contour of the dimensionless temperature are symmetry respect to horizontal plane at low value of Richardson number while symmetry deforms at large value.

Mixed convection, nanofluid, annulus