AtmoFlow - Investigation of Atmospheric-Like Fluid Flows Under Microgravity Conditions

Zaussinger, Florian; Canfield, P.J.; Froitzheim, Andreas; Travnikov, V. V.; Haun, Peter; Meier, Martin; Meyer, Antoine; Heintzmann, P.; Driebe, T.; Egbers, Christoph

doi:10.1007/s12217-019-09717-7

Cited by 12 publications

(5 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To induce TEHD convection within the fluid, a gravity-like central force field is applied via an electric tension by grounding the outer shell and applying an electric potential at the inner shell. All geometrical parameters of the system, dielectric fluid properties and boundary values are outlined in Table 1 and are similar to those used by Zaussinger et al [19].…”

Section: Model Formulation and Boundary Conditionsmentioning

confidence: 99%

“…All geometrical parameters of the system, dielectric fluid properties and boundary values are outlined in Table 1 and are similar to those used by Zaussinger et al. [19].…”

Section: Model Formulation and Boundary Conditionsmentioning

confidence: 99%

“…An example of such an experiment is the GeoFlow project that 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]. For this purpose, numerical studies are important to provide and define a parameter range that allows the design of the experiment accordingly.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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

Gaillard,

Szabo,

Egbers

2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

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.

show abstract

Section: Model Formulation and Boundary Conditionsmentioning

confidence: 99%

“…All geometrical parameters of the system, dielectric fluid properties and boundary values are outlined in Table 1 and are similar to those used by Zaussinger et al. [19].…”

Section: Model Formulation and Boundary Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

Gaillard,

Szabo,

Egbers

2023

Proc Appl Math and Mech

View full text Add to dashboard Cite

show abstract

“…The 1985 experiments on the shuttle Challenger used an apparatus built by John E. Hart at the University of Colorado [30,29]. These experiments have continued on the International Space Station (ISS) [25,66]. Experiments on fluids in microgravity have also been performed using aircraft flying a parabolic trajectory like NASA's famous "Vomit Comet".…”

Section: Microgravity Laboratory Experiments With Spherical Symmetrymentioning

confidence: 99%

Meteorology and Oceanography on a Flat Earth

Boyd

2020

Preprint

View full text Add to dashboard Cite

To build insight into the atmosphere and ocean, it is useful to apply qualitative reasoning to predict the geophysical fluid dynamics of worlds radically different from our own such as exoplanets, earth in Nuclear Winter, other solar system worlds, and far future terrestial climates. Here, we look at atmospheric and oceanic dynamics on a flat earth, that is a disc-shaped planet rather like Sir Terry Pratchet's fantasy Discworld. Altough this has the disadvantage that this geometry is completely imaginary, there is a rich array of videos by flat earth evangelists whose errors illuminate how concepts can be misconceived and misapplied by amateurs and freshman science studients. As such, this case is very useful to geophysics instructors. We show that weather and ocean flows on a flat, nonrotating earth and a rotating spherical planet are wildly different. These differences are a crushing debunk of the flat earh heresy, if one were needed. The "high contrast" of these very different atmospheres and oceans is valuable in instilling the open-mindedness that is essential to understand excoplanets, Nuclear Winter and Post-Climate-Apocalypse earth.

show abstract

“…The thermo-electric mechanism can be linked to geophysical or atmospheric flows. Indeed, in a curved channel, the electric gravity provides a central force field that allows for the experimental investigation of planet-like systems (see Chandra & Smylie 1972;Yavorskaya, Fomina & Belyaev 1984;Zaussinger et al 2019;Travnikov & Egbers 2021). Another application concerns the possibility to enhance the heat transfer between two surfaces (see Turnbull & Melcher 1969;Fogaing et al 2014;Jawichian, Siedel & Davoust 2023).…”

Section: Introductionmentioning

confidence: 99%

Thermo-electric convection in a cylindrical annulus during a sounding rocket flight

Meyer,

Meier,

Motuz

et al. 2023

J. Fluid Mech.

View full text Add to dashboard Cite

An experiment on convective flows induced by the dielectrophoretic force was performed under the microgravity condition provided during a sounding rocket flight. The dielectrophoretic force possesses a non-conservative term that can be seen as resulting from an electric gravity. That gravity can be responsible for an electric Rayleigh–Bénard convection between a hot inner cylinder and a cold outer cylinder when an electric field is applied in the radial direction. Four cells with independent temperature and electric field controls allowed the investigation of eight different values of the electric Rayleigh number relatively close to the onset of the thermo-electric instability. A linear stability analysis is performed to predict the stability threshold and the evolution of the growth rate of the instability. The three-dimensional structure of the flow is captured by simultaneous particle image velocimetry and by shadowgraphy. The amplitude of the instability modes and the time evolution of the flow is analysed, and various methods are proposed to extrapolate the experimental critical value of the electric Rayleigh number for the onset of convection. The measured critical electric Rayleigh number is in agreement with the prediction of the linear stability theory. The comparison of the new experimental results with previous ones from parabolic flight campaigns highlights the importance of long-term microgravity for the achievement of thermal convection at low values of the control parameters.

show abstract

AtmoFlow - Investigation of Atmospheric-Like Fluid Flows Under Microgravity Conditions

Cited by 12 publications

References 54 publications

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

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

Meteorology and Oceanography on a Flat Earth

Thermo-electric convection in a cylindrical annulus during a sounding rocket flight

Contact Info

Product

Resources

About