Abstract
An interesting phenomenon, which was observed during experimental research work carried out on a two-phase thermosyphon with water as the working fluid, is described. The phenomenon is a pulsed boiling at low pressure and was called the “Geyser Effect”. The heat transfer coefficient at the thermosyphon evaporator has been measured and a functional law, which links this coefficient with the pressure and the specific thermal flux, is proposed; a correlation of the type Nu * = C Re * aPr b is also shown to represent satisfactorily the experimental data.
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