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首页> 外文期刊>Journal of Thermophysics and Heat Transfer >Capillary Limit of Evaporator Wick in Alkali Metal Thermal-to-Electric Converters
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Capillary Limit of Evaporator Wick in Alkali Metal Thermal-to-Electric Converters

机译：碱金属热电转换器中蒸发器芯的毛细管极限

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摘要

Vapor anode, multitube alkali metal thermal-to-electric converters are being developed for potential use in space and terrestrial electric power generation. In these converters, the capillary pressure head produced in the evaporator wick circulates the sodium working fluid. A two-dimensional, thermal-hydraulic model of the porous evaporator wick and of the liquid sodium return artery is developed and thermally coupled to an integrated model of a five-beta″-alumina solid electrolyte (BASE) tube, stainless-steel sodium converter (PX-3A), and an eight-tube, Mo-41%Re sodium converter. Results showed that the capillary limit in the evaporator wick of the PX-3A converter is reached at zero electrical current, when the thermal input power to the converter exceeds 16 W, or the hot-side temperature exceeds 1136 K. For the Mo-41%Re converter, these values are 22 W and 1150 K, respectively. Before reaching the capillary limit, however, two or more of the following temperature limits occurred in both converters: 1) the TiNi metal-ceramic braze joints' temperature exceeded 1123 K, 2) the evaporator wick surface temperature exceeded 1023 K, or 3) the temperature difference between the cold end of the BASE tubes and the evaporator wick surface was less than +20 K.
机译：蒸气阳极，多管碱金属热电转换器正在开发中，有可能在太空和地面发电中使用。在这些转换器中，蒸发器芯中产生的毛细管压力头使钠工作流体循环。建立了多孔蒸发器芯和液态钠回流动脉的二维热工水力模型，并将其热耦合到五种β-氧化铝固体电解质（BASE）管，不锈钢钠转化器的集成模型中（PX-3A）和一个八管Mo-41％Re钠转化器。结果表明，当转换器的热输入功率超过16 W或热侧温度超过1136 K时，PX-3A转换器的蒸发器芯的毛细管极限在零电流下达到。 ％Re转换器，这些值分别为22 W和1150K。但是，在达到毛细管极限之前，两个转换器都出现了以下两个或多个温度极限：1）TiNi金属陶瓷钎焊接头的温度超过1123 K，2）蒸发器芯表面的温度超过1023 K，或3） BASE管的冷端与蒸发器芯表面之间的温差小于+20K。

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