The capillary characteristics of the alkali metal high temperature heat pipe wick are of great significance to the normal operation of the heat pipe.In this paper,the capillary rise method and the weighing method were used to carry out the experimental study on the capillary characteristics of the high temperature liquid metal sodium in the 304 stainless steel wire mesh wick with different mesh numbers in the glove box.The variation of the capillary performance of the wick at different temperature stages was obtained.The results show that the improvement of the capillary performance of the wick is limited below 460℃,which is due to the influence of Cr2O3 oxide film on the wettability of liquid sodium on the stainless steel surface.When the temperature is higher than 460 ℃,the liquid sodium reacts with Cr2O3,and the capillary performance of the wick is obviously enhanced.The damage of liquid sodium to the oxide film on the surface of stainless steel is irreversible,and the best wettability will be maintained in the temperature change stage of the subsequent heating cycle.The capillary characteristics of wick are mainly affected by surface tension and physical properties,showing a changing trend that the mass of wick decreases with the increase of temperature.According to the capillary theory and the structure of the wick,a capillary suction model of the wick is established.The error between the predicted sodium absorption mass and the experimental value in the cooling stage is within 12％.
High-temperature heat pipeWire mesh wickLiquid sodiumCapillary characteristicsCapillary suction model
维普
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