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Descripción
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| In microgravity environments, fluids can behave much differently than on earth, which presents both interesting opportunities for experiments and challenges for fluid management systems. In the presence of vibrations, the observed (average) surfaces can differ significantly from the hydrostatic solution, which is determined by surface tension and contact energy. In many cases, high frequency vibrations act to reorient and flatten the surface, making it more nearly perpendicular to the vibrational axis. In some configurations, the vibrations induce a bulge or cavity that leads to splitting (fluid separation). Results are described here for the ``Control of Fluids in Microgravity with Vibrations'' (CFVib) experiment, which flew on the 65th ESA Parabolic Flight Campaign as part of the 2016 Fly Your Thesis! programme. The main objective of the experiment was to observe the potentially complex behaviour of vibrated liquids in a weightless environment and to investigate the extent to which vibrations can be used to influence and control fluid behaviour. The experimental set-up used twelve containers (six cuboids and six right cylinders) with configurations of water/air, silicone oil/air and a silicone oil/vacuum oil mixture. Half of the containers were subjected to vibrations using a piezoelectric bender beam assembly, while the remaining half of the containers were left to respond to the ambient inertial forces (g-jitter and residual airplane acceleration). Piezoelectric materials were used to generate high-frequency vibrations from 50 Hz to 12 kHz. Depending on the frequency, surface waves and large-scale reorientation of the interface were observed. The theory of vibroequilibria, which describes the quasi-stationary surface configurations achieved by this reorientation, was used to predict interesting parameter regimes for the experiment. For the cuboidal containers with water, particularly good agreement is found between the experimental data and the predictions of vibroequilibria simulations. | |
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Internacional
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Si |
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Nombre congreso
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The Joint Conference of the 7th International Symposium on Physical Sciences in Space (ISPS-7) & 25th European Low Gravity Research Association Biennial Symposium and General Assembly (ELGRA-25) |
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Tipo de participación
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960 |
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Lugar del congreso
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Juan-Les-Pins, Antibes, Francia |
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Revisores
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Si |
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ISBN o ISSN
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11-1111-111-1 |
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DOI
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Fecha inicio congreso
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02/10/2017 |
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Fecha fin congreso
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06/10/2017 |
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