Validation of finite element analysis strategy to investigate acoustic levitation in a two-axis acoustic levitator
| Autor: | Kamlesh J. Suthar, Michael W. Sracic |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Fluid Flow and Transfer Processes
Physics Microphone Mechanical Engineering Acoustics Computational Mechanics Condensed Matter Physics Acoustic levitation Physics::Fluid Dynamics Standing wave Transducer Physics::Plasma Physics Mechanics of Materials Levitation Harmonic Acoustic wave equation Sound pressure |
| Zdroj: | Physics of Fluids. 32:097106 |
| ISSN: | 1089-7666 1070-6631 |
| DOI: | 10.1063/5.0020026 |
| Popis: | A two-axis acoustic levitator can be used to generate a standing pressure wave capable of levitating solid and liquid particles at appropriate input conditions. This work proposes a simulation framework to investigate the two-axis levitation particle stability using a commercial, computational fluid dynamics software based on the harmonic solution to the acoustic wave equation. The simulation produced predictions of the standing wave that include a strong “+” shaped pattern of nodes and anti-nodes that are aligned with the levitator axes. To verify the simulation, a levitator was built and used to generate the standing wave. The field was probed with a microphone and a motorized-scanning system. After scaling the simulated pressure to the measured pressure, the magnitudes of the sound pressure level at corresponding high-pressure locations were different by no more than 5%. This is the first time a measurement of a two-axis levitator standing pressure wave has been presented and shown to verify simulations. As an additional verification, the authors consulted high speed camera measurements of a reference-levitator transducer, which was found to have a maximum peak-to-peak displacement of 50 ± 5 μm. The reference-levitator is known to levitate water at 160 dB. The system for this work was simulated to match the operation of the reference-levitator so that it produced sound pressure levels of 160 dB. This pressure was achieved when the transducer maximum peak-to-peak displacement was 50.8 µm. The agreement between the two levitators’ displacements provides good justification that the modeling approach presented here produces reliable results. |
| Databáze: | OpenAIRE |
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