SIMULATION OF THERMAL AND ELECTRIC FIELDS IN ELECTRODES WITH ALLOWANCE FOR MELTING AND FRITTING OF FILMS

A mathematical model is formulated, and a fi nite-diff erence method and computer programs have been developed
that allow eff ective computer simulation of the process of thermal breakdown of contact fi lms. The system of equations
includes the Stefan problem, the equations of electric transfer and of a switched circuit. The axial symmetry of the
boundary-value problem conditions is assumed. A fi nite-diff erence method in a spherical coordinate system is used
for the solution. During the development of the process, the radius of the conducting bridge made of a molten
material changes by several orders of magnitude. An eff ective solution of this problem is the use of a "moving" grid
by corresponding replacing the variables. The results of the work can be applied in the practice of research and
design of electrical apparatuses and other electrotechnical devices.
   
Author:  R. V. Arutyunyan
Keywords:  computer simulation, electric fi eld, calculation, temperature fi eld, metal electrode, Stefan problem, fi lms.
Page:  636