Communication Dans Un Congrès Année : 2024

Dynamics of the Flow Produced by a Liquid Oscillator Discharging in Still Air

Résumé

A fluidic oscillator generates a self-induced and self-sustained oscillating jet through fluid instabilities and the internal fluid dynamics within the device, without the need for any moving parts. The device finds extensive use in a variety of settings, including automotive windshield cleaning systems, sprinklers, shower heads, and Jacuzzi jets, as well as flow control applications, such as combustion optimization. Nevertheless, several open questions such as the role played by the fluid’s properties or changes in geometries are yet to be thoroughly in- vestigated. In addition, the two-phase components of such flows remain to be addressed, as the fluidic oscillators usually produce a liquid jet in a still gaseous environment, with ensuing unexplored breakup mechanisms. In this study, the behavior of a fluidic oscillator is investigated by performing experimental measurements using a high-speed camera as well as 2D and 3D numerical simulations (Fig.1). Numerical simulations were conducted employing the Volume of Fluid (VOF) method for interface tracking, alongside the Shear Stress Transport (SST) model for turbulence modeling, using OpenFOAM. A parametric study varying the liquid properties, while keeping still air at ambient temperature and pressure for the discharging environment, re- vealed that the oscillations are solely controlled by the Reynolds number and the geometry of the oscillator. It indicates that, for a fixed oscillator design and at large enough Reynolds numbers, the Strouhal number will be constant, independent of the working fluid and the oscillator’s inlet velocity. In addition, the effect of varying surface tension on the oscillation amplitude and the break-up properties of the jet will be discussed. Numerical simulations were conducted employing the Volume of Fluid (VOF) method for interface tracking, alongside the Shear Stress Transport (SST) model for turbulence modeling, using OpenFOAM. The good agreement between the numerical simulation and experimental results on the frequency and amplitude of the oscillating liquid jet enables the use of simulations to explore the effect of changes in oscillator geometry.

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Dates et versions

hal-04976574 , version 1 (04-03-2025)

Identifiants

  • HAL Id : hal-04976574 , version 1

Citer

Neda Ansari Shirvan, Nathanaël Machicoane, Zhujun Huang, Cyrille Bonamy, Henda Djeridi. Dynamics of the Flow Produced by a Liquid Oscillator Discharging in Still Air. 1st European Fluid Dynamics Conference (EFDC1), Sep 2024, Aachen, Germany, Germany. ⟨hal-04976574⟩

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