The geyser effect in a two-phase thermosyphon

The geyser effect in a two-phase thermosyphon using water as the working fluid is investigated experimentally in order to provide a foundation for future theoretical work. It is shown that boiling in a two-phase syphon is a rather complex process and that at low pressures it involves the formation of bubbles of large diameter. The nucleation of individual bubbles occurs at large time intervals which, however, decrease when the specific thermal flux increases. An important conclusion is that the cyclic phenomenon observed in the thermosyphon can be studied in the evaporator using special methods for boiling-related phenomena.