Modeling Magnetically Excited and Magnetically Damped Liquid Metal Flow

Dual frequency AC and DC magnetic field levitation melting of metals

“…Intense internal fluid flow is visually observed, apparently being in the turbulent regime for earthbound and even in the microgravity conditions [4]. This behaviour was also predicted in numerical simulations [5]. The combination of AC and DC magnetic fields was recently recognized as an efficient tool for the thermo-physical property measurements without a contact to contaminating walls [6,7].…”

Levitated Liquid Dynamics in Reduced Gravity and Gravity-Compensating Magnetic Fields

“…The pseudospectral code SPHINX 6,8,10 is used to obtain the coupled EM and computational fluid dynamics solutions accounting for the magnetic force excited turbulent flow. The solution includes the turbulence damping by the high magnetic field both for the large-scale flow and for the small-scale turbulent properties.…”

“…Some modes of surface motion are modified in the presence of strong uniform field. 6,7 The damping of this oscillation is relatively low and persists even at even higher magnetic fields.…”

“…In the pseudo-spectral code SPHINX, 6,8,10 the EM force is computed from an integral equation representation. This has an advantage that the boundary conditions are not explicitly required and the EM field can be solved only in the regions where it is needed.…”

“…However, the magnetically modified turbulence could make the effective viscosity behave in a nonlinear fashion depending on the DC and AC magnetic field intensity. 6 The flow in typical melting conditions is approaching the conditions with laminar viscosity and heat transfer when a uniform DC magnetic field exceeds about 4-5 T. In addition to the modified damping, the electrically conducting liquid droplet in a high DC magnetic field behaves quite differently to the nonconducting one: some oscillation modes are damped completely, and other modes are persisting for long times or damped moderately. 7 On a larger scale, the magnetic suspension of liquid reactive materials, for example titanium alloys, can be used for high-quality castings.…”