About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Materials Research in Reduced Gravity
|
| Presentation Title |
Bubble nucleation due to ultrasound in electromagnetically levitated droplets. |
| Author(s) |
Catherine E H Tonry, Andrew Kao, Valdis Bojarevics, Koulis Pericleous |
| On-Site Speaker (Planned) |
Catherine E H Tonry |
| Abstract Scope |
Contactless electromagnetic levitation of metallic droplets reduces heterogeneous nucleation due to the absence of solid surface contact. International Space Station studies have then attributed bulk nucleation in subcooled melts to convection caused magnetohydrodynamic and Marangoni effects. However, acoustic waves in the liquid droplet generated by the alternating current magnetic field are another largely unexplored potential mechanism. Depending on resonance conditions, such ultrasonic waves can lead to cavitation which with the resulting bubbles shown to promote nucleation and microstructure refinement in terrestrial experiments. In this case, solidification would typically start from the bulk as opposed to the surface.
We present numerical models demonstrating the magnitude of acoustic waves, resonance conditions, and turbulent flow. These are compared analytically to the conditions at which we expect bubbles to nucleate in the system, giving us a measure of nucleation location and frequency. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Modeling and Simulation, Other |