Chinese Journal of Vacuum Science and Technology, 1996, 16: 140–143. Liu R., Dai Y., Li B., et al., Study on the vacuum distillation of pure metals (II): Basic law and applications. Kanemura T., Kondo H., Furukawa T., et al., Analytical and experimental study of the evaporation and deposition rates from a high-speed liquid lithium jet. The appropriate probability density functions for emission from a surface/m −1 The mean molecular free path of the gas/m θ The arithmetic average velocity of gas molecules/m The distance between point x and point x′/m T Total pressure contribution of incoming molecules/Pa R Total pressure contribution of released molecules/Pa P in This research made the evaporation process of liquid lithium in vacuum molecular flow clearer, and provided theoretical support for the space reactor and nuclear fusion related fields. At the same time, the evaporation process under variable wall temperature conditions was simulated. The effects of temperature, the evaporation coefficient, back pressure, and length-to-diameter ratio on the evaporation process were studied the variation trends and reasons of the molecular flux and the pressure during the evaporation process were analyzed. A two-dimensional symmetric model (3.5 mm×20 mm) was established to simulate the transient evaporation process of liquid lithium at wall temperatures of 750 K, 780 K, 800 K, 810 K, 825 K, and 850 K, respectively. Based on the available experimental values of the saturated vapor pressure of liquid metal lithium, the relationship between saturated vapor pressure and temperature of liquid lithium in the range of 600 K–900 K was obtained. ![]() The motion of lithium atoms in the evaporation process was analyzed through a succession of studies. Based on the COMSOL Multiphysics simulation software, this study carried out modeling and numerical simulation for the evaporation process of liquid metal lithium in the vacuum free molecular flow state.
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