Abstract 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.

    Highlights The dielectrophoretic effect in the cylindrical annuli has been considered. Numerical investigation of the thermo-electric coupling (TEC) has been performed. The TEC becomes important in the gaps with radius ratio η > 0.6 . The TEC stabilizes the basic state. The TEC reduces the heat transfer.


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    Titel :

    Influence of the thermo-electric coupling on the heat transfer in cylindrical annulus with a dielectric fluid under microgravity


    Beteiligte:

    Erschienen in:

    Acta Astronautica ; 129 ; 88-94


    Erscheinungsdatum :

    2016-08-26


    Format / Umfang :

    7 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch