Development of magnetic liquid metal suspensions for magnetohydrodynamics

作者：Carle Florian; Bai Kunlun; Casara Joshua; Vanderlick Kyle; Brown Eric^*

来源：Physical Review Fluids, 2017, 2(1): 013301.

DOI：10.1103/PhysRevFluids.2.013301

We demonstrate how to suspend various magnetic and nonmagnetic particles in liquid metals and characterize their properties relevant to magnetohydrodynamics (MHD). The suspending method uses an acid as a flux to eliminate oxidation from both metal particles and liquid, which allows the particles to be wetted and suspended into the liquid if the particles have higher conductivity than the liquid. With this process we were able to suspend a wide range of particle materials and sizes from 40 nm to 500 mu m into three different liquid metal bases and volume fractions phi up to the liquid-solid transition phi(c). By controlling the volume fraction of iron particles in liquid eGaIn, we increased the magnetic permeability by a factor of 5.0 and the electrical conductivity by 13% over that of the pure liquid metal, 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. By adding nonmagnetic zinc particles, we increased the viscosity by a factor of 160 while keeping the magnetic and electrical properties nearly constant, which would allow independent control of MHD effects from turbulence.

• 出版日期2017-1-30