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Development of magnetic liquid metal suspensions for magnetohydrodynamics

Florian Carle and Kunlun Bai

Joshua Casara

Kyle Vanderlick

Eric Brown*

  • Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511, USA

  • School of Natural Sciences, University of California, Merced, California 95343, USA

  • Department of Chemical and Environmental Engineering, Yale University, New Haven, Connecticut 06511, USA

  • Department of Mechanical Engineering and Materials Science, Yale University, New Haven, Connecticut 06511, USA and School of Natural Sciences, University of California, Merced, California 95343, USA

  • *eric.brown@yale.edu
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Phys. Rev. Fluids 2, 013301 – Published 30 January, 2017

DOI: https://doi.org/10.1103/PhysRevFluids.2.013301

Abstract

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 μm into three different liquid metal bases and volume fractions ϕ up to the liquid-solid transition ϕc. 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. We show that the suspensions flow like Newtonian fluids up to the volume fraction of the liquid-solid transition ϕc.

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Phys. Rev. Fluids 2, 013301– Published 30 January, 2017
  • Received 21 January 2016
Article part of CHORUS

©2017 American Physical Society

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