A numerical analysis is presented on the reflux condensation of binary vapor (R113+R11) in a two-phase closed thermosyphon in order to predict its variable conductance behavior and to clarify the detailed mechanism. It was shown that, in the case of smaller heat load, a non-condensing region is formed in the upper part of the condensing section due to the accumulation of the more volatile component of vapor (R11), and the length of the non-condensing region increases with decreasing heat load. As a result, the temperature difference between the inlet vapor and the condensing wall is kept nearly constant for varying heat load. The calculated temperature difference and system pressure were compared with experimental data, and reasonable agreements were obtained.
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