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Flow features of a new fluidic oscillator using time-resolved PIV measurement and 3D numerical simulation

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Abstract

The current study measures the instantaneous velocity field inside and outside a new designed fluidic oscillator using planar time-resolved PIV technique on its symmetry plane in a water tank. The instantaneous velocity field showed that the interaction of four vortices with the jet was the main reason of jet oscillation inside the main chamber. Three-dimensional transient numerical solutions were also carried out using Ansys-Fluent 2020R2 software. Four turbulence models (k-ε, k-ε RNG, k-ω, and k-ω SST) were used for these numerical solutions, which their results were then compared with the PIV results, qualitatively and quantitatively. The comparison showed that the k-ε and k-ω SST models were better for simulating the flow of the new oscillator. However, both models over-predicted the jet spreading angle and oscillation frequency compared to the PIV results. A similar PIV measurement was accomplished outside the conventional oscillator to compare the time-averaged velocity fields of the new and conventional oscillators. The comparison showed that the amplitude and frequency of the new oscillator were, respectively, lower and higher than those of the conventional one. The time-averaged velocity and momentum flux outside the new oscillator was significantly higher than for the conventional one.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: The datasets generated during and/or analysed during the current study are available from the corresponding author on reasonable request.]

Abbreviations

A :

Throat area (m2)

D :

Throat height (m)

D h :

Hydraulic diameter (m)

Fr :

Oscillation frequency (1/s)

f :

Oscillation frequency (1/s)

H :

Domain height outside the oscillator (m) rate

k :

Turbulence kinetic energy (m2/s2)

M :

Momentum flux (kg.m/s2)

P :

Pressure (Pa)

Q :

Volumetric flow rate (m3/s), Q-criterion (1/s2)

Re:

Reynolds number

S :

Strain rate (1/s2)

St:

Strouhal number

t :

Time (s)

u :

Velocity (m/s)

U j :

Jet velocity at the throat (m/s)

w :

Throat width, oscillator width (m)

x :

X-coordinate, axial distance

y :

Y-coordinate

z :

Z-coordinate

δ ij :

Kronecker delta function

ε :

Turbulence kinetic energy dissipation rate

μ :

Dynamic viscosity (kg/m-s)

μ t :

Turbulent viscosity

ρ :

Fluid density (kg/m3)

υ :

Kinematic viscosity (m2/s)

ω:

Vorticity (1/s)

Γ:

Circulation (m2/s)

1:

Related to the primary chamber

2:

Related to the secondary chamber

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Acknowledgements

This study was supported by the Brain Pool Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science and ICT (NRF-2019H1D3A2A01061428). This work was also supported by the National Research Foundation of Korea (NRF) grant, which is funded by the Korean government (MSIT) (No. 2011-0030013, No. 2020R1A5A8018822).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan, Iran

    Mahdi Nili-Ahmadabadi

  2. School of Mechanical Engineering, Pusan National University, Busan, Republic of Korea

    Hadi Samsam-khayani, Shabnam Mohammadshahi & Kyung Chun Kim

  3. Department of Naval Architecture and Ocean Engineering, Pusan National University, Busan, Republic of Korea

    Dae-Seung Cho

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  1. Mahdi Nili-Ahmadabadi
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Correspondence to Mahdi Nili-Ahmadabadi or Kyung Chun Kim.

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Nili-Ahmadabadi, M., Samsam-khayani, H., Mohammadshahi, S. et al. Flow features of a new fluidic oscillator using time-resolved PIV measurement and 3D numerical simulation. Eur. Phys. J. Plus 136, 953 (2021). https://doi.org/10.1140/epjp/s13360-021-01947-2

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