Effect of Cylinder vortex shedding on downstream Impinging Jet Oscillation through Wake Interaction

摘要

Unsteady Jet oscillation is an effective method to enhance time-averaged heat transfer rates. The unsteady lateral jet oscillation can be achieved using the vortex structures periodically shed from a cylinder placed on the jet plate upstream of the nozzle in a channel with an initial crossflow. The current study is focused to determine the effect of cylinder-jet distance on the heat transfer rate in the jet oscillating and non-oscillating regime. The cylinder-jet distance(S/d), is varied from 1.1 to 2. The results concluded that the oscillating cases have a negligible effect on the overall heat transfer rate compared to non-oscillating cases. However, the local data do show uniform Nusselt number distribution in the stagnation region, promoting uniform temperature with reduced thermal stresses. The local results showed the oscillating cases followed the same trend in profile with different amplitudes. The non-oscillating cases compared to each other displayed similar trend and amplitude; these results were in a close match with jet with no crossflow results. Future work includes further investigation of a particular oscillating case 3 (S/d =1.3) due to its unusual behavior in the heat transfer profile.