Vykonova pole v modelech sklarskych tavicich peci

The thesis has dealt with the electric melting of glass in all-electric glass melting furnace. The mathematical modelling based on using the programme Fluent has been used for observing the processes taking place in all-electric glass melting furnace. The Fluent has solved the mass, momentum and heat transfer, but this programme has not contained the solution of an electric multiphase current field. It was necessary to program it by using the Fluent user subroutines. The fundamental differential equations describing the mass, momentum and heat transfers have been introduced in the first half of the theoretical part of the thesis. The relations characterising the electric multiphase current field and the method of its simplification using symbolic method based on the phasors have been described as well. The method of determining of the electric boundary conditions, i. e. determining of the electric potential on the electrodes needed for solution of the electric multiphase current field, has been worked out within the framework of the theoretical part. The relations have been derived for the electrodes fed by A. C. power supplies represented by one-phased or three-phased transformers. The verification of the programme Fluent modified by user subroutines and verification of the calculation of electric boundary conditions comparing with the results from the physical model has been the first problem solved in the experimental part. The parameters of the mathematical model have been identical with the parameters of the physical model. The results from the both models have been in good accord. In the second half of the experimental part the adjusted mathematical model has been used for finding the influences of the electrode parameters on providing of energy in the glass melting furnace. The influence of the electrode connection, the distance between electrodes and electrode length has been observed. The results have demonstrated, that the providing of the energy, the character of current, the efficiency of the melting process and the lifetime of the glass melting furnace can be influenced by suitable setting of the electrode parameters. The solution of the electric multiphase current field and the derivation of the electric boundary conditions needed for its solution have been the main contribution of the thesis. The additional contribution has been the fact that created mathematical model has given an engineer the strong instrument for monitoring of the processes, which would be very difficult or impossible to observe in the real glass melting furnace or the physical modelAvailable from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi