Numerical analysis of single and multiple jets

Numerical study of asymmetric and axisymmetric thermal jet with entropy generation concept

“…Where, the profiles reach the maximum then start decreasing more quickly concerning an asymmetric jet in comparison with concerning an axisymmetric jet. After these, the generation of local entropy per unit of volume remains constant [13]for all three types of jets. Viscous dissipation becomes negligible [11,15].…”

“…where, , are, the thermal conductivity and the dynamic viscosity effective for the fluid [13], respectively. (̇)…”

“…The mesh quality and resolution play are of major importance in the numerical solution accuracy and stability [13]. Thus, many meshes were tested to observe that the simulation results are independent of the mesh refinement level.…”

“…The evolution of the generation of local entropy per volume unit for the three configurations versus the normalized distance x / Dj, for a density ratio Rρ = 0.66 is present in Figure 06. It turned out that when the normalized distance x / Dj is fewer than 2.5; the generation of local entropy per unit of volume Neglected since there are no velocity and temperature gradients [13]. When x / Dj is in the distance between 2.5 to 8, strong velocity gradients are caused by turbulent disturbances; these it's enhance the rapid augment in the rate of generation of local entropy per unit of volume [9].…”

“…The main results obtained indicated that,the efficiency of jet mixing, the quantity of entrained air and the rate of generation of total entropy reduces when the velocity of the co-current increases. For their part, Boussoufi et al [13] have studied numerically the flow characteristics and entropy generation of multiple jets and succeeded in showing that, the multiple jets augments the rate of generation entropy. It was also studied by Morsli et al [14][15][16][17][18] and others differently in several areas.…”