Flow and condensation of vapor with high partial pressure non-condensable gas in a separate heat pipe
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摘要: 設計建立了一套以水為工質的分離式熱管系統實驗臺,系統冷凝端采用水冷套管式換熱器.在此實驗臺基礎上研究了不抽真空、有大量不凝性氣體存在于分離式熱管的凝結放熱問題,測定了在不同的入口蒸汽溫度、循環蒸汽流量、冷卻水進口溫度及流量條件下混合氣體在圓管內凝結換熱的情況,分析了這些參數對換熱過程的影響.同時,還對套管內含高分壓不凝性氣體——空氣——的水蒸汽凝結換熱物理模型進行了研究,并建立了相應的數學模型.模型中除了質量守恒、動量守恒、能量守恒和界面控制方程外,還增加了流動擴散和凝結控制方程.模型結果顯示蒸汽放熱量與實驗測定值基本吻合,偏差在8%~15%之間.Abstract: A set of separate heat pipe (SHP) with water as medium was built. The flow and condensation of vapor with non-condensable and high partial pressure air in the SHP were measured in the experiment. The physical model of the flow and condensation of vapor-air mixture was studied and the related numeral model was founded. Except for the mass, momentum and energy conservation equations, the diffusion and condensation equations were added to calculate the distribution of the mixture in the mathematical model. The numerical result agrees well with the experimental data, and the deviation is between 8% and 15%.
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Key words:
- separate heat pipe （SHP） /
- non-condensable gas /
- condensation /
- diffusion
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