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Thermoelectrohydrodynamic convection in a finite cylindrical annulus under microgravity
Published online by Cambridge University Press: 20 August 2024
Abstract
Numerical simulations of thermoelectrohydrodynamic convection in a dielectric liquid inside a finite-length cylindrical annulus with a fixed temperature difference have been performed with increasing high-frequency electric tension under microgravity conditions. The electric field, coupled with the permittivity gradient, generates a dielectrophoretic buoyancy force whose non-conservative part can induce thermoelectric convection in the liquid. The liquid remains in a conductive state below a critical value of the applied electric voltage. At a critical value, a supercritical bifurcation occurs from the conductive state to a convective state made of stationary helicoidal vortices. A further increase of electric voltage leads to oscillatory helicoidal vortices and then to wavy patterns before spoke patterns dominate the convective flow. The dielectrophoretic force is shown to enhance the heat transfer from the hot to cold walls due to induced convective flows. Particularly, these results demonstrate that the dielectrophoretic buoyancy force holds promise to replace the gravitational force to induce efficient heat transfer in microgravity conditions, and they contribute to a better fundamental understanding of heat transfer in microgravity.
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- © The Author(s), 2024. Published by Cambridge University Press
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‡
Present address: Faculty of science and engineering, Doshisha University, 1–3 Tatara Miyakodani, Kyotanabe-shi, Kyoto 610-0321, Japan
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Kang et al. supplementary movie 1
Contours of the temperature (θ) at the central surface (x = 0.5) for VE = 1000.
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Kang et al. supplementary movie 2
Contours of the radial velocity component (ur) at the central surface (x = 0.5) for VE = 1000.
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Kang et al. supplementary movie 3
Contours of the iso-value of Q = 0.6 at the central surface (x = 0.5) for VE = 1000.
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Kang et al. supplementary movie 4
Iso-surface of Q = 0.6 for VE = 1000.
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Kang et al. supplementary movie 5
Contours of the temperature (θ) at the central surface (x = 0.5) for VE = 1500.
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Kang et al. supplementary movie 6
Contours of the radial velocity component (ur) at the central surface (x = 0.5) for VE = 1500.
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Kang et al. supplementary movie 7
Contours of the iso-value of Q = 1.5 at the central surface (x = 0.5) for VE = 1500.
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Kang et al. supplementary movie 8
Iso-surface of Q = 1.5 for VE = 1500.
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Kang et al. supplementary movie 9
Contours of the temperature (θ) at the central surface (x = 0.5) for VE = 2000.
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Kang et al. supplementary movie 10
Contours of the radial velocity component (ur) at the central surface (x = 0.5) for VE = 2000.
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Kang et al. supplementary movie 11
Contours of the iso-value of Q = 3 at the central surface (x = 0.5) for VE = 2000.
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Kang et al. supplementary movie 12
Iso-surface of Q = 3 for VE = 2000.
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Kang et al. supplementary movie 13
Contours of the temperature (θ) at the central surface (x = 0.5) for VE = 3000.
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Kang et al. supplementary movie 14
Contours of the radial velocity component (ur) at the central surface (x = 0.5) for VE = 3000.
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Kang et al. supplementary movie 15
Iso-surface of Q = 10 for VE = 3000.
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Kang et al. supplementary movie 16
The contours of temperature (θ) at the central surface (x = 0.5) for VE = 4000.
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Kang et al. supplementary movie 17
The contours of temperature (θ) at the central surface (x = 0.5) for VE = 5000.
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Kang et al. supplementary movie 18
The three-dimensional vortical structures for VE = 4000 (Q = 20).
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Kang et al. supplementary movie 19
The three-dimensional vortical structures for VE = 5000 (Q = 30).
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