Rotating spherical gap convection in the GeoFlow International Space Station (ISS) experiment

Zaussinger, Florian; Haun, Peter; Szabo, Peter S. B.; Travnikov, V. V.; Kawwas, Mustafa Al; Egbers, Christoph

doi:10.1103/physrevfluids.5.063502

Cited by 11 publications

(6 citation statements)

References 51 publications

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“…Researchers have previously produced planet-like convection with other gravity-mimicking forces, such as the dielectrophoretic force that arises in strong and oscillating electric fields. But these other forces were so weak that the experiments required a microgravity environment-such as that of an orbiting space lab-to detect the effects [3]. By contrast, the acoustic force is strong enough that the experiments can be carried out in a terrestrial lab.…”

Section: Credit: J P Koulakis Et Al [1]mentioning

confidence: 99%

Sound Waves Mimic Gravity

Schirber¹

2023

Physics

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A recently discovered acoustic effect allows a hot gas to simulate the gravity-induced convection within a star or giant planet. By Michael Schirber Sometimes a light bulb goes on-literally-and a scientific advance is made. Researchers studying an acoustic effect in high-powered light bulbs have developed a system that mimics the gravitational field around planets and stars [1]. The team demonstrated that sound waves in the bulb generate a force that pulls gas toward the bulb's center. This gravity-like force causes the gas to move around in convection cycles that resemble fluid flows in the Sun and in giant planets. With further improvements, the system could be used to investigate convection behavior that is too difficult to simulate with computers.

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Section: Credit: J P Koulakis Et Al [1]mentioning

confidence: 99%

Sound Waves Mimic Gravity

Schirber¹

2023

Physics

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“…Inner radius 𝑅 1 focused on planetary interiors that served on the International Space Station, see [17,18]. A second spherical shell experiment is now prepared and will study planetary atmospheres [19].…”

Section: Property Symbol Valuementioning

confidence: 99%

“…The major application of TEHD convection is to enhance heat transfer and to study its convective nature compared to fee convection. However, there are other areas of interest such as the possibility of creating convection with a central force field [12][13][14][15][16]. This enables to study spherical shell convection to investigate convective flow in planetary interiors or atmospheres.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐electrohydrodynamic convection in the thermally driven spherical shell with differential rotation

Gaillard,

Szabo,

Egbers

2023

Proc Appl Math and Mech

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This study investigates thermo‐electrohydrodynamics (TEHD) convection in the thermally driven spherical shell with differential shell rotation. The TEHD convection is induced by an electric tension applied at the inner spherical shell whereas the outer shell is grounded. Hence, an electric central force field is present similar to terrestrial gravity in a planetary system. Spherical rotation mimics planetary rotation and is used to investigate the convective nature of the spherical gap. The results demonstrate four main convective regimes that depend on the strength of the electric tension and rotational forcing. The convective pattern formation is investigated by a Hammer‐Aitov projection, the radial and meridional velocity components to indicate convective or advective fluid motion related to the individual forcing. The heat transfer is characterised by the Nusselt number and showed a strong dependence on the forcing.

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“…The last existing way to perform long duration μg conditions was to experiment onboard the International Space Station, e.g. the Geoflow experiment where a thermoelectric instability was achieved inside a spherical shell [19].…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric instabilities in a circular Couette flow

Meyer

Yoshikawa

Szabo

et al. 2023

Phil. Trans. R. Soc. A.

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The stability of a non-isothermal circular Couette flow is analyzed when subjected to a dielectrophoretic force field. Outward and inward heating configurations are considered when the inner cylinder is rotating and the outer cylinder is at rest. In addition, an alternating voltage is applied between the two cylinders to induce a radial electric buoyancy that acts on the dielectric fluid. The linear stability analysis provides the threshold for the first transition to instability, as well as the corresponding wavenumber and frequency of the modes. This article is part of the theme issue ‘Taylor–Couette and related flows on the centennial of Taylor’s seminal Philosophical Transactions paper (part 1)’.

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Rotating spherical gap convection in the GeoFlow International Space Station (ISS) experiment

Cited by 11 publications

References 51 publications

Sound Waves Mimic Gravity

Sound Waves Mimic Gravity

Thermo‐electrohydrodynamic convection in the thermally driven spherical shell with differential rotation

Thermoelectric instabilities in a circular Couette flow

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