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Numerical Study and Sensitivity Analysis of a Flowmeter Based on a Fluidic Oscillator

Shahidi, Hassan | 2025

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57895 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Ebrahimi, Abbas; Ghamkhar, Kamran
  7. Abstract:
  8. In this thesis, the flow behavior in a fluidic oscillator-based flowmeter is investigated using two-dimensional numerical simulations and experimental tests. The primary objective of this study is to analyze the effect of geometrical parameters and flow conditions on the performance of the fluidic oscillator and to determine the relationships between key parameters such as oscillation frequency, oscillation amplitude, pressure drop, and the standard deviation of the Strouhal number. The numerical simulations are conducted using the Unsteady Reynolds-Averaged Navier-Stokes (URANS) model and the finite volume method, with the k−ω SST turbulence model applied for flow modeling. The computations are performed within a Reynolds number range of less than 5500. Various geometrical parameters, including the nozzle throat size, the length, and the width of the oscillator cavity, are varied, and their influence on the oscillatory behavior of the flow is analyzed. The numerical results indicate that increasing the nozzle throat size enhances the oscillation onset velocity and decreases the ratio of frequency to inlet velocity. Conversely, reducing the nozzle throat size leads to an increase in pressure drop and oscillation amplitude. Furthermore, the effect of other parameters, such as the aspect ratio of the cavity and the feedback channel length, on the stability and efficiency of the oscillator is examined. To validate the numerical results, an experimental setup is designed and fabricated for the baseline geometry, and experimental tests are conducted under controlled conditions. The results from the experimental tests and numerical simulations are compared, demonstrating a consistent trend and agreement between numerical and experimental data. These findings can serve as a design guideline for optimizing fluidic oscillator-based flowmeters
  9. Keywords:
  10. Two Dimentional Numerical Simulation ; Oscillation Frequency ; Flowmeter ; Sensitivity Analysis ; Fluidic Oscillator ; Geometric Sensitivity Analysis ; Experimental Investigation

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