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Frequency Variation of Sweeping Jets

Fluidic oscillators are devices that create a sweeping motion with a liquid or gas without moving parts and just fluid dynamics. There are different types of fluidic oscillators, one being a feedback, wall-attachment type. Fluidic oscillators have been researched in roles for heat transfer (such as impingement cooling) against steady jets since the fluidic oscillators can cover a larger area than a steady jet. An important characteristic of fluidic oscillators is the frequency of the jet, which can be varied by different ways. Computational Fluid Dynamics (CFD) was used to begin studies into the variation of the frequency and its effect on heat transfer capabilities on a heated impingement surface. The inlet velocity of the fluidic oscillator varied from a baseline velocity to twice and quadruple the baseline velocities. This has shown an increase in the sweeping frequency but shows variation in other characteristics as well. The design of a physical experiment has begun to eventually compare the CFD data with real data.