The Transient Evolution of Flow Due to the Excitation Pulse in Oscillating Drop Experiments in Microgravity Electromagnetic Levitation

Abstract In oscillating drop experiments, surface oscillations in a molten sample are captured and analyzed to determine the tension viscosity of melt without need contact liquid sample. electromagnetic levitation, initiated using an excitation pulse field. The variation force field drives rapid acceleration while also changing flow pattern. During quasi-static conditions prior pulse, displays “positioner-dominated” pattern with 4 recirculation loops hemisphere. However, accelerating transitions into “heater-dominated flow” which there only 2 Following rapidly slows quickly returns present before pulse. For many combinations parameters, transition results very complicated velocity time; that is topic this paper.