Critical Modes of Thermoelectric Convection Instabilities in a Vertical Slot.

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From: Microgravity - Science and Technology(Vol. 33, Issue 1)
Publisher: Springer
Document Type: Report; Brief article
Length: 226 words

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Keywords: Vertical slot; Dielectric liquid; Dielectrophoretic force; Thermoelectric convection 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. Author Affiliation: (1) Normandie Université, UNIHAVRE, Laboratoire Ondes et Milieux Complexes (LOMC), UMR 6294 CNRS, 53 Rue de Prony, 76058, Le Havre Cedex, France (2) Université Côte d'Azur, CNRS, Institut de Physique de Nice, 06100, Nice, France (3) Department of Mechanical Engineering, Jeonbuk National University, 567 Baekje-daero, Deokjin-gu, 54896, Jeonju-si, Jeollabuk-do, Republic of Korea (e) innocent.mutabazi@univ-lehavre.fr Article History: Registration Date: 12/03/2020 Received Date: 04/14/2020 Accepted Date: 12/02/2020 Online Date: 01/25/2021 Byline:

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Gale Document Number: GALE|A649655249