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Critical Modes of Thermoelectric Convection Instabilities in a Vertical Slot

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Abstract

Investigation of the natural convection in a dielectric fluid confined inside a vertical slot subject to a constant horizontal temperature gradient and a high-frequency electric field was revisited. The thermoelectric coupling produces a dielectrophoretic force which contains a term called electric buoyancy associated with an electric gravity. Similar to the Archimedean buoyancy, this force can induce thermo-electro-convective instability in a stable fluid flow. Including the feedback effect of the electric field on the flow, a three-dimensional linear stability analysis is performed to characterize the instability induced by this force. Different critical modes are found depending on the intensity of the electric field: stationary hydrodynamic modes, oscillatory thermal modes and stationary electric modes. The threshold of the electric modes is independent of the Prandtl number in contrast with the threshold of the hydrodynamic and thermal modes. The obtained results are compared with those of previous studies.

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Acknowledgements

The present work has benefited from the financial support from the CNES (French Space Agency) and the French National Research Agency (ANR) through the program “Investissements d’Avenir (Grant N°ANR-10 LABX-09-01”. The doctoral thesis of E.B.B. is co-funded by CNES and Region Normandie.

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Correspondence to Innocent Mutabazi.

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This article belongs to the Topical Collection: The Effect of Gravity on Physical and Biological Phenomena

Guest Editor: Valentina Shevtsova

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Barry, E.B., Yoshikawa, H.N., Fogaing, M.T. et al. Critical Modes of Thermoelectric Convection Instabilities in a Vertical Slot. Microgravity Sci. Technol. 33, 16 (2021). https://doi.org/10.1007/s12217-020-09856-2

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  • DOI: https://doi.org/10.1007/s12217-020-09856-2

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