Development of an acoustic levitation based contactless metrological apparatus: Applications to surface tension and viscosity measurements of low melting temperature Ga droplets
Résumé
Aerospace engine efficiency is directly linked to the hot source temperature. Due to the very
high temperature and mechanical stresses, turbine blades and discs have to be manufactured
using alloys with exceptional high temperature properties. Nickel-based superalloys combine
these properties. Conventional manufacturing processes are expensive, so manufacturers are
promoting digital design methods. But numerical models rely on accurate thermophysical
databases to be effectively representative of real processes. Due to the high chemical reactivity
of molten nickel-based superalloys, viscosity and surface tension measurements are difficult.
We have developed a non-contact metrological apparatus based on the acoustic levitation
phenomenon, to perform these measurements on samples in liquid form. In order to develop
this complex device, we have already carried out some measurements on water and low melting
point Ga samples. This first phase of development has allowed us to identify improvements to
be made in order to levitate high melting point reactive alloys.
Domaines
Sciences de l'ingénieur [physics]
Origine : Fichiers produits par l'(les) auteur(s)