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: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
16 May 2019
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| 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 |
| Summary: | 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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| Item Description: | Gesehen am 22.07.2019 |
| Physical Description: | Online Resource |
| ISSN: | 1879-2189 |
| DOI: | 10.1016/j.ijheatmasstransfer.2019.04.068 |