(510h) Numerical Study of Radial Slot Jet into Crossflow

Jet in cross-flow can be found in many engineering applications such as combustion practices, drying processes, and quenching systems. The objective of this study was to use a CFD technique to investigate the impact of the injection angle and height of the radial slot jet into cross-flow on the flow field. Ansys, Fluent 18.1, the CFD package was used to perform all simulation cases. Five different angles of 10, 20, 30, 40 and 50 degree were considered in this study as shown in Figure 1. Also, three different sizes of the slot height ratio h/D, slot height over a cross-flow pipe diameter, of 0.0167, 0.012, and 0.0083 were taken into consideration, as shown in Figure 2. The results showed that the slot jet direction is changed from horizontal direction into a vertical direction and became as coaxial jets where the center one is the cross-flow, and the outer one is the jet flow. This behavior causes a reduction in the available exit area for the cross-flow, which leads to an increase in the average velocity of the cross-flow, as shown in Figure 1 and Figure 2. The reduction of this area is increase with the decrease of the injection angle for the same slot height as shown in Figure 1. Moreover, the area reduction increases with increase of the slot height for the same jet injection Figure 2. A correlation for the diameter of the cross-flow exit area as a function of the injection angle was proposed based on the numerical results.