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Vibroequilibria in microgravity: Comparison of experiments and theory
P Salgado Sánchez1, J Fernández1, I Tinao1
1Center for Computational Simulation, Escuela Técnica Superior de Ingeniería Aeronáutica y del Espacio, Universidad Politécnica de Madrid, Plaza de Cardenal Cisneros 3, 28040 Madrid, Spain.
Experiments in reduced gravity show that fluid interfaces reorient due to vibrations, forming distinct shapes. This vibroequilibria effect can control fluid positioning in space.
Area of Science:
- Fluid dynamics
- Microgravity science
Background:
- Vibroequilibria describes fluid reorientation under vibration.
- This effect is amplified in microgravity due to reduced gravitational forces.
Purpose of the Study:
- To quantitatively investigate the vibroequilibria effect in reduced gravity.
- To explore fluid behavior in cylindrical and cuboidal containers under resonant vibrations.
Main Methods:
- Experiments conducted during parabolic flights simulating reduced gravity.
- Vibrations induced using piezoelectric ceramics and a resonant cantilever beam.
- Analysis of fluid interface shapes and comparison with theory and simulations.
Main Results:
- Two distinct resonant modes produced different vibroequilibria surface shapes: one with a central dip, the other flattened.
- Fluid interfaces showed a tendency to orient perpendicularly to the vibrational axis.
- Quantitative comparison with vibroequilibria theory and Navier-Stokes simulations showed good agreement.
Conclusions:
- Vibroequilibria theory accurately predicts fluid behavior in reduced gravity.
- The phenomenon offers potential for manipulating and positioning fluids in space environments.
- Frequency and resonant mode selection are key to controlling fluid behavior.
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