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Techniky zpracování tuhých a tekutých kovů založené na elektromagnetické indukci
Doležel, Ivo ; Šolín, Pavel ; Musil, Ladislav ; Ulrych, B. ; Karban, P. ; Barglik, J.
A lot of up-to-date industrial technologies associated with treatment of solid and liquid metals are based on thermal and force effects of electromagnetic field. The fundamental process is induction heating of metals that precedes a number of consequent operations such as tempering, drying, melting, stirring, hardening, hot pressing etc. The paper summarizes physical essence of the above processes (that usually represent complex coupled problems) and presents their mathematical and computer models as well as possible methods of their solutions.
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Řešení nestacionárních problémů vířivých proudů integrálním přístupem
Doležel, Ivo ; Karban, P.
Althout most eddy problems are theoretically solved by various differential techniques, there exist several classes of tasks where use of the differential approach may be complicated or even prohibitive. Mentioned can be, for example, problems characterized by geometrical incommensurability of individual subdomains, by their motion or by ignorance of the boundary conditions. In such a case, application of the integral approach may be an advantage. The paper presents the theoretical background of the method.
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Elektromagnetické a teplotní pole v roztaveném hliníku míchaném v kelímkové indukční peci
Barglik, J. ; Doležel, Ivo ; Ulrych, B. ; Mach, M. ; Trutwin, D.
The paper deals with the mathematical and computer modeling of quasi-coupled electromagnetic, temperature and hydrostatic fields in molten aluminium in a typical crucible induction furnace. After the process of melting, the melt is further inductively heated to reach the casting temperature that is typically higher by about 200 C than the melting point. Then the active power of inductors is reduced to a level making possible only to keep the temperature at that value. During that time, however, more or less intensive stirring of the melt takes place because of presence of the Lorentz forces acting in melt.
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Porovnání 2D a 3D modelu dávkovače zinku
Mach, M. ; Musil, Ladislav
The paper deals with the mathematical and computer modelling of electromagnetic zinc feeder, which is a device for exact dosing of molten zinc. 2D and 3D models of the feeder were developed, solved and the results were compared and discussed. Computations were carried out by the professional FEM-based codes FEMLAB, OPERA, QuickField and a number of single-purpose user procedures written by the authors
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Polařský a obvodový model dávkovače zinku
Musil, Ladislav ; Praglowska-Gorczynska, Z.
Electromagnetic feeders of molten metals are used in some industrial technologies, particularly for accurate dosing. Mathematical model of such devices represents a complicated coupled task characterised by interaction of electromagnetic, temperature and flow fields. The paper deals with numerical computation of several important quantities of the device providing its circuit parameters
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