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Dielectrophoretic force-driven convection in annular geometry under Earth’s gravity

A radial temperature difference together with an inhomogeneous radial electric field gradient is applied to a dielectric fluid confined in a vertical cylindrical annulus inducing thermal electro-hydrodynamic convection. Aims: Identification of the stability of the flow and hence of the line of margi...

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Main Authors: Seelig, Torsten (Author) , Meyer, Antoine (Author) , Gerstner, Philipp (Author) , Meier, Martin (Author) , Jongmanns, Marcel (Author) , Baumann, Martin (Author) , Heuveline, Vincent (Author) , Egbers, Christoph (Author)
Format: Article (Journal)
Language:English
Published: 16 May 2019
In: International journal of heat and mass transfer
Year: 2019, Volume: 139, Pages: 386-398
ISSN:1879-2189
DOI:10.1016/j.ijheatmasstransfer.2019.04.068
Online Access:Verlag, Volltext: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2019.04.068
Verlag, Volltext: http://www.sciencedirect.com/science/article/pii/S0017931018361854
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Author Notes:Torsten Seelig, Antoine Meyer, Philipp Gerstner, Martin Meier, Marcel Jongmanns, Martin Baumann, Vincent Heuveline, Christoph Egbers

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245 1 0 |a Dielectrophoretic force-driven convection in annular geometry under Earth’s gravity  |c Torsten Seelig, Antoine Meyer, Philipp Gerstner, Martin Meier, Marcel Jongmanns, Martin Baumann, Vincent Heuveline, Christoph Egbers 
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520 |a A radial temperature difference together with an inhomogeneous radial electric field gradient is applied to a dielectric fluid confined in a vertical cylindrical annulus inducing thermal electro-hydrodynamic convection. Aims: Identification of the stability of the flow and hence of the line of marginal stability separating stable laminar free (natural) convection from thermal electro-hydrodynamic convection, its flow structures, pattern formation and critical parameters. Methods:Combination of different measurement techniques, namely the shadowgraph method and particle image velocimetry, as well as numerical simulation are used to qualify/quantify the flow. Results: We identify the transition from stable laminar free convection to thermal electro-hydrodynamic convective flow in a wide range of Rayleigh number and electric potential. The line of marginal stability found confirms results from linear stability analysis. The flow after first transition forms a structure of axially aligned stationary columnar modes. We experimentally confirm critical parameters resulting from linear stability analysis and we show numerically an enhancement of heat transfer. 
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