Effect of the Initial Conditions on the Growth of Thermoelectric Instabilities During Parabolic Flights.

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From: Microgravity - Science and Technology(Vol. 31, Issue 5)
Publisher: Springer
Document Type: Report; Brief article
Length: 220 words

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Abstract :

Keywords: Dielectrophoretic force; Cylindrical annulus; Growth rate; Initial conditions Abstract: The dielectrophoretic force is applied between two differentially heated cylinders under microgravity conditions obtained during parabolic flight. The electric field is activated at various moments of the microgravity phase in order to control the initial condition at which the dielectrophoretic force intervenes. The time evolution of the flow is measured by particle image velocimetry and that of thermal plumes is captured by shadowgraphy. The growth rate of the instability during microgravity conditions is determined from these measurements. It is found that the closer the initial condition to the purely conductive state is, the faster the instability grows. Author Affiliation: (1) grid.8842.6, 0000 0001 2188 0404, Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology Cottbus-Senftenberg, Siemens-Halske-Ring 14, D-03046, Cottbus, Germany (2) grid.460771.3, 0000 0004 1785 9671, Laboratoire Ondes et Milieux Complexes, UMR 6294 CNRS-Université du Havre, Normandie Université, 53, rue de Prony, B.P. 540, F-76058, Le Havre Cedex, France Article History: Registration Date: 15/10/2019 Received Date: 13/03/2019 Accepted Date: 15/10/2019 Online Date: 14/11/2019 Article note: This article belongs to the Topical Collection: Thirty Years of Microgravity Research - A Topical Collection Dedicated to J. C. Legros Guest Editor: Valentina Shevtsova Byline: Antoine Meyer (1), Martin Meier (1), Marcel Jongmanns (1), Torsten Seelig (1), Christoph Egbers (1), Innocent Mutabazi (2)

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Gale Document Number: GALE|A606615781