Convection driven by magnetic field

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SUMMARY

The discussion centers on the influence of magnetic fields on convection in non-conducting fluids, specifically liquid oxygen, within a 5L spherical enclosure. The enclosure is heated from below and cooled from above, maintaining temperatures below the boiling point. The primary focus is on identifying a suitable magnetic source, with considerations for compactness and weight. The use of YBCO superconductors is highlighted for achieving a magnetic flux density of 0.8 - 1.1 T, while alternatives such as toroidal magnets and solenoids are also explored.

PREREQUISITES
  • Understanding of fluid dynamics and convection principles
  • Knowledge of magnetic field generation techniques
  • Familiarity with superconductors, particularly YBCO
  • Basic principles of thermal conduction in fluids
NEXT STEPS
  • Research the design and application of Helmholtz coils in fluid dynamics
  • Explore the properties and applications of YBCO superconductors in magnetic field generation
  • Investigate the effectiveness of toroidal magnets in inducing convection
  • Study solenoid configurations for optimal magnetic field strength
USEFUL FOR

Researchers and engineers in the fields of fluid dynamics, materials science, and magnetic field applications, particularly those focused on convection in cryogenic fluids.

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I'm studying the effect of a magnetic field on a non-conducting fluid, such as liquid oxygen or liquid hydrogen. As I know a convective flow can be driven, if the extern magnetic field is strong enough. The extern magnetic field can be uniform or nonuniform, but the effect of convection is much greater, if there is a extern magnetic gradient acting on the fluid.

My model is 5L spherical enclosure which is filled with liquid oxygen. The enclosure is heated from below and cooled from above, so that the heat is only transferred by conduction. Both temperatures are kept below the boiling temperature. In the center of the enclosure is a magnetic source, which has to be defined.

Know I want to find a suitable magnetic source to produce the suitable magnetic field, which drives the convection. The magnetic source should be compact and leight weighted.

A idea is to take a magnetic coil, such as the Helmholtz-Coil, but this source would probably not drive the convection, because of its constant magnetic field inside the coil.

Because of fluid's temperature at about 80K it's possible to use superconductors. For example the YBCO superconductor can reach a magnetic flux density of 0.8 - 1.1 T.

Are there any other possibilies?
 
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What about a toroidal magnet. Or wrapping wire into a solenoid and the field would be fairly strong at the end. These are just some ideas.
 

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