A blowup phenomenon of the working fluid in a two-phase closed thermosyphon

A periodic blowup phenomenon of the working fluid is often observed in a two phase closed thermosyphon at rather low heat load operation. The phenomenon is a blowing movement of a large amount of the liquid from the evaporator to the condenser by an explosive expansion and development of a boiling bubble in the liquid pool. The fluctuating temperature distributions on the container wall of the thermosyphon are reasonably explained when compared with the visual observation of the movement of the working fluid.