Development of magnetic liquid metal suspensions for magnetohydrodynamics
arXiv:1512.02575 · doi:10.1103/PhysRevFluids.2.013301
Abstract
A new class of materials is developed that is a liquid with both high conductivity and magnetic susceptibility for magnetohydrodynamic (MHD) applications. We develop a general method for making such suspensions and demonstrate that various magnetic and non-magnetic metal particles, from 40 nm - 500 microns in diameter, can be suspended in liquid gallium and its alloys. The method uses an acid solution to prevent oxidation of the liquid metal and metallic particles, which allows wetting and thus suspending. We can increase the magnetic permeability by a factor of 5.0 by controlling the packing fraction of magnetic particles, which gives these materials the potential to exhibit strong MHD effects on the laboratory scale that are usually only observable in the cores of planets and stars. We can independently tune the viscosity by a factor of 230 by adding non-magnetic particles, which would allow independent control of MHD effects from turbulence.
arXiv commentMore details and clarifications to the procedure were added to version 4
References in corpus (9)
- Random Packings of Frictionless Particles
- Generation of magnetic field by dynamo action in a turbulent flow of liquid sodium
- Detection of a flow induced magnetic field eigenmode in the Riga dynamo facility
- Effect of oxidation on the Mechanical Properties of Liquid Gallium and Eutectic Gallium-Indium
- Shear thickening and jamming in densely packed suspensions of different particle shapes
- Dynamo regimes and transitions in the VKS experiment
- The Madison plasma dynamo experiment: a facility for studying laboratory plasma astrophysics
- The stability of MHD Taylor-Couette flow with current-free spiral magnetic fields between conducting cylinders
- Resistive and ferritic-wall plasma dynamos in a sphere