A theoretical framework for predicting the steady-state operational characteristics of two-component heat pipes is established. The laws of conservation of mass and energy as well as thermodynamic phase equilibrium relations are applied to the system, and the governing relations between the various system parameters are specified. Measurements of the operational characteristics of a water–ethanol heat pipe indicate that complete separation into two pure components did not occur in any of the experiments. The observed degrees of separation and other operational characteristics agree well with the predictions.

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