Thermophysical Property Measurement using Levitation Technique under Microgravity and on Ground

摘要

We review the thermophysical property measurement of high-temperature liquids using the levitation technique from the view point of comparisons of the result on the microgravity conditions with its on the ground conditions. We start to perform thermophysical properties measurement using levitation technique in International Space Station (ISS). The electrostatic levitation system in KIBO/ISS named ELF starts to perform thermophysical property measurements from autumn in 2016.However in ISS experiment time is limited, so we cannot obtain full data set of thermophysical properties with temperature and compositional dependences. We would obtain the benchmark data from the ISS experiments, therefore we need to obtain much data from the ground experiments in order to extrapolate the data obtained in ISS. On ground, we have been trying to apply the aerodynamic levitation (ADL) technique with the surface oscillation technique with acoustic speaker systems. We discuss the surface oscillation phenomena of ADL droplet comparing with that obtained in ISS. From these discussions, we propose the correction method for the surface oscillation data taken on ground.