Abstract
Electrically heated filaments are frequently used to study catalytic processes. In this respect the phenomenon of propagation of nonlinear thermal waves which separate regions of different temperatures on an iron filament heated by an electrical current in H 2 atmosphere has been theoretically and experimentally studied. It has been shown that the character of wave propagation is dependent on the condition of feeding the current. The waves are propagated with constant velocity when the feeding takes place from a stabilized current source, while the velocity is variable when a stabilized voltage source is used. In both cases the formation of non-uniform stable steady states (structures) is possible. In the first case they exist for a unique value of the parameter (current) while for the second case, stable structures are observed for a certain interval of values of the parameter (voltage).
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