In this study, the geyser boiling in a two-phase closed thermosyphon was investigated experimentally. Parameters such as filling ratio (FR), aspect ratio (AR), heat input (Q) and the coolant mass flow rate (View the MathML source) affect the geyser boiling in thermosyphon. A series of experiments were carried out to investigate the influence of the above parameters on the period and intensity of geyser boiling under the normal conditions. Two copper pipes of 1000 mm length with 15 and 25 mm inside diameter and methanol as the working fluid were employed. An experimental equation was offered to correlate the data for the period of geyser boiling. The results showed that the period of geyser boiling decreased by increasing the heat load and aspect ratio and increased by increasing the filling ratio. The results were compared with the results found in the literature.

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