Vol. 23, No. 3 (2024), Sim24267 https://doi.org/10.24275/rmiq/Sim24267

Numerical and experimental study of a fluidic oscillator

 

Authors

R. Gonzalez-Mora, S. A. Arreola-Villa, B. Figueroa-Espinoza, S.R. Galvan-Gonzalez, A. Aguilar-Corona

Abstract

Fluidics is a discipline that uses physics of fluids to produce output signals similar to those used in electronics, such as logical operations or oscillations for a wide variety of applications. Most devices have no moving parts and are relatively easy to produce. This investigation uses 3D Direct Numerical Simulations (DNS) and an experimental prototype to characterize a fluidic oscillator. The geometrical design (man-shaped) causes a self-sustained switching between two outlets. Two important vortices were identified, related to the output selection: one small vortex near one of the control ports (Coanda effect), responsible for the switching, and a larger one on the mixing zone (belly), facilitating the flow towards the opposite side. The oscillation frequency for the experimental prototype was determined by the application of a Fast Fourier transform of the output signal, captured with a microphone. The onset of the oscillations, as well as the frequencies in terms of the Strouhal (Sr) and Reynolds (Re) numbers were obtained. The Sr is a monotonically increasing function Re, up to a transition Reynolds number (maximum) where Sr starts decreasing with Re (at quasi-constant frequency). The numerical simulation results were in agreement with the experiments, and allowed for the visualization of the mechanisms responsible for the switching. These results suggest that numerical techniques can be used for design purposes in fluidics.

Keywords

Fluidic Oscillator, Coanda Effect, DNS, Fluidics.

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