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首页> 外文期刊>Journal of Heat Transfer >Analytical and Experimental Analysis of a High Temperature Mercury Thermosyphon
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Analytical and Experimental Analysis of a High Temperature Mercury Thermosyphon

机译：高温汞热虹吸管的分析和实验分析

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摘要

High temperature thermosyphons are devices designed to operate at temperatures above 400℃. They can be applied in many industrial applications, including heat recovery from high temperature air fluxes. After a short literature review, which shows a deficiency of models for liquid metal thermosyphons, an analytical model, developed to predict the temperature distribution and the overall thermal resistance, is shown. In this model, the thermosyphon is divided into seven regions: three regions for the condensed liquid, including the condenser, adiabatic region, and evaporator; one region for vapor; one for the liquid pool; one for the noncondensable gases; and another for the tube wall. The condensation phenomenon is modeled according to the Nusselt theory for condensation in vertical walls. Numerical methods are used to solve the resulting equations and to determine the temperature distribution in the tube wall. Ideal gas law is applied for the noncondensable gases inside the thermosyphon, while the evaporator and condenser heat transfer coefficients are obtained from literature correlations. Experimental tests are conducted for thermosyphon with mercury as working fluid, designed and constructed in the laboratory. The results for two thermosyphons with different geometry configurations are tested: one made of a finned tube in the condenser region and another of a smooth tube. The finned tube presents lower wall temperature levels when compared with the smooth tube The experimental data are compared with the proposed model for two different liquid pool heat transfer coefficients. It is observed that the comparison between the experimental data and theoretical temperature profiles is good for the condenser region. For the evaporator, where two distinct regions are observed (liquid film and pool), the comparison is not so good, independent of the heat transfer coefficient used. In a general sense, the model has proved to be a useful tool for the design of liquid metal thermosyphons.
机译：高温热虹吸管是设计用于在400℃以上的温度下运行的设备。它们可用于许多工业应用，包括从高温空气流中回收热量。经过简短的文献综述后，表明液态金属热虹吸管模型缺乏，然后显示了用于预测温度分布和整体热阻的分析模型。在该模型中，热虹吸管分为七个区域：三个用于冷凝液的区域，包括冷凝器，绝热区域和蒸发器；一个蒸气区域；一个用于液体池；一种用于不凝性气体；另一个用于管壁。冷凝现象是根据Nusselt理论建模的，用于垂直壁中的冷凝。数值方法用于求解所得方程并确定管壁中的温度分布。理想气体定律适用于热虹吸管内的不可冷凝气体，而蒸发器和冷凝器的传热系数可从文献关联中获得。在实验室中设计和制造了以汞为工作液的热虹吸管的实验测试。测试了两种具有不同几何构型的热虹吸管的结果：一种由冷凝器区域中的翅片管制成，另一种由光滑管制成。与光滑管相比，翅片管的壁温较低。对于两种不同的液体池传热系数，将实验数据与建议的模型进行了比较。可以看出，实验数据和理论温度曲线之间的比较对于冷凝器区域是好的。对于蒸发器，在其中观察到两个不同的区域（液膜和熔池），比较效果不佳，与所使用的传热系数无关。在一般意义上，该模型已被证明是用于设计液态金属热虹吸管的有用工具。

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