Convegni ATI - Accesso riservato soci CTI

Autore: O. Manca, S. Nardini, D. Ricci, S. Tamburrino

Collana: CA - 63 - Palermo 2008

Note:
In this paper, reference is made to natural convection in air in a divergent channel with the two principal flat plates at uniform heat flux. A numerical analysis is carried out in laminar, two dimensional transient-state conditions in order to study the effects of the heat flux, the wall emissivity, the inclination angle and the spacing. The physical domain under investigation consists of two non-parallel plates which form a divergent channel, with uniform heat flux set equal to 120 W/m2. The imbalance between the temperature of the ambient air and the temperature of the heated plates draws a mass of fluid into the vertical channel. Fluid is air and the flow in the vertical channel is assumed to be two-dimensional, laminar, incompressible, with negligible viscous dissipation. All thermophysical properties of the fluid are assumed to be constant and evaluated at the
ambient temperature of 300 K, except for the dependence of density on the temperature (Boussinesque approximation) which gives rise to the buoyancy forces.