Journal
ACTA ASTRONAUTICA
Volume 129, Issue -, Pages 88-94Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actaastro.2016.08.031
Keywords
Natural convection; Electrohydrodynamics; Spectral methods; Direct numerical simulation
Categories
Funding
- Region Haute-Normandie
- French Spatial Agency (CNES)
- French National Research Agency(ANR) through the program Investissements dAvenir [ANR-10LABX-09-01, LABEX EMC3]
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The present note gives the result of direct numerical simulations of the convective flow induced by the dielectric force in a cylindrical annulus under microgravity conditions. A dielectric fluid confined between two coaxial cylinders is subject to a high-frequency tension and a radial temperature gradient. The resulting buoyancy force creates a supercritical convective flow when the critical value of the electric Rayleigh number is exceeded. This flow is made of stationary helicoidal vortices. The effect of the thermo-electric coupling is sensitive for large values of the radius ratio: it stabilizes the conductive state and reduces the slope of the increase of the heat transfer and of the kinetic energy. (C) 2016 IAA. Published by Elsevier Ltd. All rights reserved.
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