Dynamical and Thermal Behavior of Two Horizontal Jets Impinging a Vertical Heated Plate: Effects of Jet Velocities Ratio and Impinging Distance

This paper presents a numerical study using CFD to analyze the dynamical and thermal behavior of two turbulent parallel jets of different velocities impinging on a vertical heated plate, to determine the optimal parameters for heat transfer. Two-dimensional unsteady numerical simulations based on the finite volume method are performed. The 2D-URANS equations coupled with the standard k−ε turbulence model is used. The results show a maximum turbulent kinetic energy near the heated plate, due to the strong deflection of the faster jet towards the slower jet, for small velocity ratios. Furthermore, for a velocity ratio of 0.25, local heat transfer is maximal for an impinging distance between 4w and 8w. On the other hand, for velocity ratio λ=0.75 and impinging distances exceeding 8w; a better local cooling is obtained. These results confirm the influence of the velocity ratio on the dynamic and thermal fields. They effectively control the thermal profile.