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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental research on flow mode transition of falling film flow on metal foam wrapped tubes
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Experimental research on flow mode transition of falling film flow on metal foam wrapped tubes

机译：金属泡沫包装管上落叶薄膜流动模式转变的实验研究

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摘要

Flow mode transitions on metal foam wrapped tubes in shell and tube heat exchanger may affect the condensate characteristics obviously because the condensate inundation severely depends on the flow mode. In the present study, the flow mode transitions were experimentally investigated by observing the flow modes on metal foam wrapped tubes and determining the Reynolds numbers (Re) of flow mode transitions. The experimental conditions cover the metal foam pore density from 5 to 40 PPI (pore per inch), the tube spacing from 6 to 20 mm, working fluids of pure water and water/ethylene glycol mixture, and the flowing process of increasing flow rate and decreasing flow rate. The experiment results show that, as the PPI increases, the Reynolds numbers of droplet/droplet-column (D/DC) transition and droplet-column/column (DC/C) transition both increase, but the Reynolds numbers of column/column-sheet (C/CS) transition and column-sheet/sheet (CS/S) transition both decrease; as the Galileo number increases, the Reynolds numbers of flow mode transition increases. It is also found that, the Reynolds numbers of the D/DC and DC/C transition does not change obviously with the tube spacing, while the Reynolds numbers of the C/CS and CS/S transition increases sharply at first and then slightly with the increase of tube spacing. Correlations for flow mode transitions on metal foam wrapped tubes are developed, and the predicted results of the correlations agree with 94% of experimental data within a deviation of 20%.
机译：在壳体和管热交换器中金属泡沫包裹管上的流动模式过渡可以显着影响冷凝物特性，因为冷凝物淹没严重取决于流动模式。在本研究中，通过观察金属泡沫包裹管上的流动模式并确定流动模式转换的雷诺数（RE）来实验研究流动模式转变。实验条件覆盖金属泡沫孔密度，从5至40 ppi（每英寸孔），管间距为6至20mm，纯水和水/乙二醇混合物的工作流体，以及流速的流动速度的流动过程减少流速。实验结果表明，随着PPI的增加，雷诺/液滴 - 柱（D / DC）转换和液滴列/柱（DC / C）转变的转型均增加，但雷诺数/列 - 片材（C / CS）过渡和柱纸/张（CS / S）转变均减少;随着伽利略号的增加，流动模式转换的雷诺数增加。还发现，D / DC和DC / C转换的雷诺数不会随管间距而显而易见，而C / CS和CS / S转变的雷诺数首先急剧增加，然后略微增加管间距的增加。开发了金属泡沫包裹管上的流动模式过渡的相关性，并且相关性的预测结果与94％的实验数据在20％的偏差内一致。

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