Résumé:
In this paper, a numerical investigation of natural convection in three-dimensional
cylindrical and divergent annular duct is studied. In the inner cylinder of thin thickness, are
mounted a cylindrical blocks which subjected to a volumetric heat generation. The governing
equations of mass, momentum and energy equation for both the fluid and the solid are solved by
the finite volume method using the commercially available CFD software fluent .The effect of
the number of heated blocks (N = 1, 2, 3 and 5) and the inclination angle of the divergent
(φ = 0°, 15°, 23° and 45°) have been studied . The temperature and velocity contours fields,
stream lines also the local Nusselt number have been presented here for Ra = 2.105 and N = 3
while temperature and velocity profiles in the span-wise direction of the flow were plotted for
Ra = 1.105 (φ = 0°, 15°, 23° and 45°) and (N = 1, 2, 3 and 5) also the local and average Nusselt
number for those geometries.