Untersuchungen von Konvektionsvorgaengen in Kristallzuechtungsanordnungen mit unterschiedlichen Randbedingungen unter dem Einfluss von Magnetfeldern und Mikrogravitation Abschlussbericht

By three-dimensional time-independent numerical calculations a model arrangement of vertical zone melting has been simulated using three different approximations of the magnetohydrodynamic equation system. In order to analyze magnetohydrodynamic effects on fluid flow in electrically conducting melts, the obtained numerical values were compared with results from model experiments using liquid gallium as the melt. Magnetic field damping on fluid flow could be proved by simulation of the Bridgman crystal growth. It is demonstrated that temperature fluctuations within the melts, due to non-stationary states of fluid flow, can be measured without mechanical or electrical contact by measurement of the fluid flow induced time-dependent magnetic field. (WEN)SIGLEAvailable from TIB Hannover: F95B88+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Forschung und Technologie (BMFT), Bonn (Germany)DEGerman