Abstract
The double diffusive natural convection inside a two dimensional horizontal concentric annulus that is firstly containing a stably stratified solution is numerically investigated by using a finite element method calculation code. The cavity is exposed to a constant heat flux rate from the inner cylinder whilst its outer cylinder is cooled by a constant temperature medium. A dimensionless parameter is determined such as a different form of the Rayleigh number which is base on a length scale that is a vertical displacement of a heated element of the fluid in a stably stratified solution under Neumann boundary conditions. In each case the calculation results are compared with the related experimental results. In order to confine the calculated conditions to the experiments, the real concentration profiles that are reported during the experiments are used. More over the calculations are conducted by using a linear concentration profile too. Hereby the effects of the initial concentration on the flow patterns and the physical characteristics of the fluid can be more understood. The time wise variation of the average heat transfer coefficient is calculated and compared with the experimental results for each case.
