Flow Pattern and Heat Transfer in a Cylindrical Annulus Under 1 g and Low-g Conditions: Experiments

Citation metadata

From: Microgravity - Science and Technology(Vol. 30, Issue 5)
Publisher: Springer
Document Type: Report
Length: 286 words

Document controls

Main content

Abstract :

Byline: Martin Meier (1), Marcel Jongmanns (1), Antoine Meyer (1), Torsten Seelig (1), Christoph Egbers (1), Innocent Mutabazi (2) Keywords: Thermal convection; Electrohydrodynamics; Dielectrophoretic force; Microgravity; Cylindrical annulus; Heat transfer Abstract: We investigate the thermal convection in an annular cavity, with differentially heated inner and outer cylinders, under the influence of a dielectrophoretic (DEP) force. Applying a temperature gradient to a liquid creates buoyancy driven thermal convection. When additionally a radially acting DEP-force is applied by means of an alternating electric field, the pattern of this convective flow changes which also leads to a change in the heat transfer. Depending on the parameters, e.g. an axisymmetric structure with toroidal vortices appears. Another possible structure are columnar vortices, which extend through the annulus. To isolate the effect of the DEP-force, this experiment is not only conducted in the laboratory, but also in microgravity conditions during parabolic flights. By using DEP-induced convective flows in microgravity a comparable heat transfer as with buoyancy convection under Earth's condition can be obtained. A better understanding of the heat transport mechanisms inside a dielectric liquid confined between two concentric cylinders can deliver solutions for the improvement of the heat transport in many technical applications. Author Affiliation: (1) 0000 0001 2188 0404, grid.8842.6, Department of Aerodynamics and Fluid Mechanics, Brandenburg University of Technology Cottbus-Senftenberg, Siemens-Halske-Ring 14, 03046, Cottbus, Germany (2) Laboratoire "Ondes et milieux complexes", Normandie Universite, UNIHAVRE, CNRS UMR 6294, Normandie, 53, rue de Prony, Le Havre, 76058, France Article History: Registration Date: 13/08/2018 Received Date: 19/01/2018 Accepted Date: 13/08/2018 Online Date: 28/08/2018 Article note: This article belongs to the Topical Collection: Interdisciplinary Science Challenges for Gravity Dependent Phenomena in Physical and Biological Systems Guest Editors: Jens Hauslage, Ruth Hemmersbach, Valentina Shevtsova

Source Citation

Source Citation   

Gale Document Number: GALE|A560182093