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Study of a Variable Conductance Two-Phase Closed Thermosyphon With Two-Component Working Fluid

In this article a numerical investigation is performed on a two-phase closed thermosyphon. Particular attention is given to the condenser section. The working fluid is a binary mixture that consists of two components (R 11 + R 113) causing a variable conductance behavior in the thermosyphon. The mass, energy, and species conservation equations in conjunction with the overall mass conservation and continuity of momentum at liquid–vapor interface constraints and the thermodynamic equilibrium condition are solved numerically by use of the integral method. The effects of diffusion at the interface of effective and noneffective (shut-off) lengths in condenser are taken into account. The results of the present model are compared with available experimental data and it is found that there is a good agreement with experimental data at low evaporator power levels.