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Non-contact method for analysis of cavitating flows
Ignacijo Biluš1, Benjamin Bizjan2, Luka Lešnik1
1University of Maribor, Faculty of Mechanical Engineering, Smetanova Ulica 17, 2000 Maribor, Slovenia.
Ultrasonics
|July 16, 2017
Summary
This study introduces a new non-contact method using high-speed imaging to analyze pressure and velocity in cavitating flows. The technique shows strong correlation between velocity and pressure fluctuations, validating its use for cavitation analysis.
Area of Science:
- Fluid Dynamics
- Acoustics
- Non-invasive Measurement Techniques
Background:
- Cavitation, characterized by bubble formation and collapse, significantly impacts fluid systems.
- Accurate measurement of pressure and velocity during cavitation is crucial for understanding and mitigating its effects.
- Traditional methods for cavitation analysis can be invasive and limited in spatial-temporal resolution.
Purpose of the Study:
- To develop and validate a novel non-contact method for simultaneous analysis of pressure and velocity in cavitating flows.
- To investigate the relationship between velocity fields and pressure fluctuations during cavitation.
- To assess the accuracy of the proposed method against reference measurements.
Main Methods:
- Implementation of a non-contact analysis method using high-speed camera flow visualization (ADMflow software).
- Calculation of pressure fluctuations based on Brennen's theory and a modified Rayleigh-Plesset equation.
- Determination of velocity fields using an advection-diffusion equation-based algorithm.
- Reference pressure pulsation measurements using a hydrophone.
Main Results:
- Observed attached cavitation with distinct structures on an ultrasonic probe tip.
- Calculated pressure fluctuations and velocity fields from high-speed imaging data.
- Demonstrated a strong correlation between velocity fields and pressure fluctuations during cavitation dynamics.
- Validated the method's agreement with reference measurements through time series and power spectra analysis.
Conclusions:
- The developed non-contact method accurately analyzes pressure and velocity in cavitating flows.
- The study confirms a significant link between fluid velocity and pressure fluctuations in cavitation.
- This technique offers a viable alternative for non-contact, detailed analysis of cavitation phenomena.
Keywords:
Acoustic cavitationComputer-aided visualizationHydrophoneImage velocimetryPressure measurementSonotrodeMore Related Videos
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