par Shevtsova, Valentina
Référence Proceedings of the International Astronautical Congress, IAC, 2018-October
Publication Publié, 2018
Article révisé par les pairs
Résumé : An important goal of the microgravity experiments is to establish a reliable set of guaranteed convection free reference data for the validation and calibration of present and future ground based measurements. In this study the focus is placed on the experiments associated with diffusion and thermodiffusion. It is recognized that it is impossible to perform very extensive and systematic thermodiffusion studies in a microgravity environment due to the naturally limited availability of experiment time. With present technology, the coverage of the full ternary composition diagram of a single ternary system on a dense grid would require measurement times on the order of years. Thus, the improvement of the reliability and the understanding of ground based measurements can be considered as one of the most important objectives of fluid physics experiments. Even though computing power increases, further progress in the prediction of the mass diffusion coefficients is challenging. It requires a multiscale and multidisciplinary approach, combining experimental and theoretical work with computer simulations. Prediction of the thermodiffusion coefficients is even more complex because no general theory is available for the Soret effect.