Experimental Verification of the CFD Model of the Squeeze Film Lifting Effect

The presented study shows the results of the research into the squeeze film levitation phenomena. The system introduced in the investigation is composed of a vibrating surface, air squeeze film, and the surface of the body freely suspended over the film. The use of the CFD (Computational Fluid Dynam...

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Bibliographic Details
Published in:Applied sciences 2023-05, Vol.13 (11), p.6441
Main Authors: Bastian, Bartosz, Gawarkiewicz, Rafał, Wasilczuk, Michał, Wodtke, Michał
Format: Article
Language:English
Subjects:
acoustic levitation
Acoustics
Analysis
CFD calculations
Computational fluid dynamics
Design
Energy consumption
Film thickness
Fluid dynamics
Fluid-structure interaction
Hydrodynamics
Ideal gas
Journal bearings
Levitation
Measurement techniques
near-field acoustic levitation (NFAL)
Oil and gas laws
Power supply
Pressure distribution
Sensors
squeeze film acoustic levitation (SFAL)
squeeze film effect
Squeeze films
Standing waves
Vibration
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Summary:The presented study shows the results of the research into the squeeze film levitation phenomena. The system introduced in the investigation is composed of a vibrating surface, air squeeze film, and the surface of the body freely suspended over the film. The use of the CFD (Computational Fluid Dynamics) model used in the system allows us to determine the steady state, periodic behavior of the air film (described by Navier–Stokes, continuity equations, and ideal gas law), and the lifted object dynamics. The model allows us to determine multiple factors, among others, mean film thickness and pressure distribution inside the fluid film. The influence of factors, such as vibration amplitude, frequency, and load on the lifting conditions, was presented. A series of calculations show the levitations height in the range of 5.61 up to 58.12 microns, obtained for masses of samples between 5–20 g, vibration frequency of 5–25 kHz, and the motions amplitude of 0.5–1.5 µm. A series of CFD multivariable calculations for a standing wave inducer were not previously published. The CFD model was validated with the use of experiments on a specially developed test rig. The authors experimentally obtained the height of levitation up to 200 microns.
ISSN:2076-3417
2076-3417
DOI:10.3390/app13116441