Computational Fluid Dynamics Analysis of the Influence of Diameter at Inlet 2 on Heat Transfer and Fluid Flow in the Mixing Elbow

This study presents the CFD (Computational Fluid Dynamics) analysis of the mixing elbow by determining the influence of the variation in the diameter of the inlet 2 section, Diameter 2 with the use of the ANSYS FLUENT software. The flow of our problem being turbulent, was described by the Reynolds Averaged Navier-Stokes Equations (RANSE), the k-ε closure model and for the temperature field, the averaged energy conservation equation. To solve them numerically, the finite volume method and the SIMPLE scheme for Pressure-velocity coupling were chosen. The larger the Diameter 2, the more effective mixing areas, the more uniform the temperature and velocity at the outlet and the better the mixing. At the outlet, not only do the velocities and temperatures increase but their gradient also increases with an increase in Diameter 2 up to 0.025m, the presence of turbulence and the rate of heat transfer increase. For Diameter 2 equal to 0.030m, the curves are symmetrical, the temperature and velocity values ​​vary slightly over the entire outlet section, we have a better mixture but with a low heat transfer rate.