2022 Volume 39 Issue 4 Pages 390401-
A plan of measurement of interfacial tension between Cu-rich and Fe-rich immiscible liquid phases in undercooled molten Cu–Fe alloy, using an oscillating droplet method using electromagnetic levitation, is in progress at the International Space Station. In this work, numerical simulations of an oscillating composite droplet composed of core and shell phases were performed using OpenFOAM. To determine the proper composition of the CuFe alloy to measure interfacial tension, oscillations at two specific frequencies caused by the surface and interfacial tensions appearing on the surface of the droplets have been investigated in this study. Numerical results indicate that the narrow compositional variation can be permitted as a suitable condition for determining the interfacial tension. The suitable composition of Cu for measurement of interfacial tension is 21–27at% or 67–76 at % at 1550 K – 1650 K. Especially in the case of Cu25Fe75 alloy, interfacial tension can be measured at only approximately 1600 K.
