Journal
MICROGRAVITY SCIENCE AND TECHNOLOGY
Volume 30, Issue 5, Pages 653-662Publisher
SPRINGER
DOI: 10.1007/s12217-018-9636-3
Keywords
Thermal convection; Dielectrophoretic force; Microgravity; Cylindrical annulus; Heat transfer; Stability analysis
Categories
Funding
- French Space Agency (CNES)
- French National Research Agency (ANR) through the program Investissements d'Avenir [ANR-10LABX-09-01]
- Region Normandie
- DFG [EG100/20-1]
- [DLR FKZ 50WM1644]
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A dielectric fluid is confined in a stationary vertical cylindrical annulus. A temperature difference is applied between the two cylinders, as well as an alternating electric potential. This configuration creates an active force called dielectrophoretic force, which acts as a thermal buoyancy force. Different axial gravity intensities are considered, so that two thermal buoyancies will affect the flow: the thermoelectric buoyancy intervenes in the radial direction and the Archimedean buoyancy acts in the axial direction. Linear stability analysis and direct numerical simulation are performed following experimental research that has been performed during parabolic flight campaigns.
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