Science and Education Publishing American Journal of Mechanical Engineering 2328-4110 3 3A 2015 07 13 Computational Study of the Turbulent Flow inside a Waste Heat Recovery System with a 25° inclined Angle Diffuser 1 8 EN Sobhi FRIKHA Zied DRISS Laboratory of Electro-Mechanic Systems (LASEM), National School of Engineers of Sfax (ENIS), University of Sfax (US), B.P. 1173, Road Soukra km 3.5, 3038 Sfax, TUNISIA Mohamed Aymen Hagui AJME201533A1 10.12691/ajme-3-3A-1 2015 05 20 2015 06 22 2015 07 13 In this paper, we are interested on the study of the turbulent flow inside a waste heat recovery system with a 25° inclined diffuser. For thus, we have developed a numerical simulation using a CFD code. Particularly, we are interested to visualize the temperature, the velocity, the total pressure, the dynamic pressure, the vorticity, the turbulent kinetic energy, the turbulent dissipation rate and the turbulent viscosity. The numerical model is based on the resolution of the Navier-Stokes equations in conjunction with the standard k-ε turbulence model. These equations were solved by a finite volume discretization method.