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An experimental study on the critical heat flux and the instability phenomenon of a closed two-phase thermosyphon has been made. For general application, the condenser and the evaporator inner diame...ters of the test tube are designed to be different. Freon R-113 is used as a working fluid. Effects of (a) fill ratio of the working fluid in the tube, (b) outer wall temperature of the condenser, (c) heat flux and (d) geometrical configurations of the evaporator are investigated, and the critical heat flux and the maps of instability phenomenon are obtained. A correlation for estimating the critical heat flux is developed by making use of the Wallis correlation for flooding. By comparing the calculation results from it with the experiments, validity of the correlation is confirmed. In order to increase the critical heat flux, thermosyphons with three types of an internal downcomer are tested, and the critical heat flux as well as the temperature distributions along the tube are obtained. Internal circulation of the working fluid by the internal downcomer are also recognized.続きを見る
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