Cel The project suggests theoretical, numerical and experimental investigations of flow and heat and mass transfer in liquid systems with free surfaces subject to temperature gradients. The aim is to propose the ways of control of flow and heat/mass transfer during directional crystal growth by two different techniques: floating-zone (space applications) and Czochralski (ground-based applications). New, vibration, method of flow control will be studied for metallic or non-metallic crystallizing materials. Control of oscillatory convection in metallic melts, by rotating magnetic fields, will be also considered. Four basic tasks involving a fluid with a free surface (or an interface between two liquids) will be carried out.Series of floating zone experiments with semiconductor melts will be realized where melt motion and dopant segregation are controlled by vibration convection. Theoretical and numerical approaches are proposed to simulate vibrational effects taking into account(i) pulsation and average deformation of a free surface;(ii) generation of average flows in boundary layers;(iii) viscous damping of surface waves and (iv) pulsating transport of heat and vorticity.The numerical results will be used to interpret experimental results (shape and curvature of the solid-liquid interface, dopant inhomogeneities and axial macrosegregation), and to optimise ground-based and space experiments by selecting appropriate frequency and amplitude of vibration for these experiments.Theoretical investigation of basic mechanisms of average flow generation near an oscillating interface (or free surface) will be performed. It is expected to clarify the relative importance of different mechanisms of generation depending on the physical and geometrical factors. The equilibrium shape of interface and the generation of average flows will be considered for the cases of a floating zone subject to axial vibrations of a crystal (preceding problem) and for two-layer system subject to the tangential vibrations, or vibrations of linear and circular polarization in a parameter range where the long-wave instability of quasi-equilibrium takes place.Oscillatory thermocapillary convection will be studied numerically with two different approaches:(i) usual Navier-Stokes equations for viscous incompressible liquid;(ii) new hydrodynamical system of equations including the Navier-Stokes equations with additional divergent term.We will simulate the effects of controled magnetic field (constant or rotating) to damp or to control thermocapillary convection in a model of FZ crystal growth. We also plan to investigate the control of flow, heat and mass transfer during crystallization in a two-layers system (melt + encapsulant), with and without constant magnetic field, with optimization of parameters for production of monocrystals.Experimental and numerical investigations of vibrational influence on heat/mass transfer in the bulk liquid, on the liquid surface and on solid-liquid interface in Czochralski-type systems will be carried out. Studies will be executed for non-crystallizing (water-glycerin mixtures) and for crystallizing (NaNO3) objects. Hydrodynamic instabilities and temperatures fluctuations at the solid-liquid interface will be investigated. The relations between the inhomogeneities (micro- and macro-) of grown crystals and the vibration parameters (amplitude-frequency) applied to crystallizing systems will be studied. The numerical results will be used to interpret experimental results (shape of the solid-liquid interface) and to optimise crystal growth experiments by selecting appropriate frequency and amplitude of vibration which are required inputs for these experiments.One of the major objective of this consortium is to favour synergy between partners with interdisciplinary expertises (crystal growth vs. fluid dynamics) and combining different approaches (theoretical, numerical and experimental). The comparison of results of model and growth experiments will permit to derive pertinent conclusions how to use external forces (vibration, magnetic field, encapsulant) to elaborate new technologies and to improve existing growth processes (FZ and Czochralski).These studies will be primarily used to prepare new space experiments (in particular vibrating FZ, by the Freiburg group) relevant for weightlessness conditions in ESA sounding rockets and, later, on bard the International Space Station. Program(-y) IC-INTAS - International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993- Temat(-y) 6 - Engineering Sciences, Aeronautics, Space OPEN - OPEN Call Zaproszenie do składania wniosków Data not available System finansowania Data not available Koordynator Université de la Méditerranée Wkład UE Brak danych Adres IMT La jetee; Technopole de Chateau-Gombert 13451 Marseille cedex 20 Francja Zobacz na mapie Koszt całkowity Brak danych Uczestnicy (6) Sortuj alfabetycznie Sortuj według wkładu UE Rozwiń wszystko Zwiń wszystko M.V. Lomonosov Moscow State University Rosja Wkład UE Brak danych Adres Lenin Hills 119899 Moscow Zobacz na mapie Koszt całkowity Brak danych Mendeleev University of Chemical Technology of Russia Rosja Wkład UE Brak danych Adres Miusskaya sq. 125047 Moscow Zobacz na mapie Koszt całkowity Brak danych Perm State University Rosja Wkład UE Brak danych Adres Bukireva str., 15 614600 Perm Zobacz na mapie Koszt całkowity Brak danych Technical University Rosja Wkład UE Brak danych Adres Volokolamskoye Road, GSP - 47 125810 Moscow Zobacz na mapie Koszt całkowity Brak danych Universität Freiburg Niemcy Wkład UE Brak danych Adres Hebelstrasse, 25 79104 Freiburg Zobacz na mapie Koszt całkowity Brak danych Ural Branch of the Russian Academy of Sciences Rosja Wkład UE Brak danych Adres 1 Korolev street 614013 Perm Zobacz na mapie Koszt całkowity Brak danych
