INTRODUCTION



        1.1- Physical problem description

            The problem studied is shown in the the next figure. Air at standart pressure and temperature (293 K) enters  at the velocity of 1.8 m/s (Reynolds number = 3000) and exits  through the outlet. Its properties are as follows :
 
density (kg/m3)
Molecular viscosity (Pa.s)
Specific heat (J/Kg.K)
Thermal conductivity (W/m.K)
1.205
1.81 E-5
1006.0
2.637 E-2

 
 

        1.2- Modelling strategy

       The following modelling strategy is used :