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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of condensation heat transfer characteristics on metal foam wrapped tubes under sloshing conditions
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Experimental study of condensation heat transfer characteristics on metal foam wrapped tubes under sloshing conditions

机译：沉积条件下金属泡沫包装管对凝结传热特性的实验研究

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摘要

Metal foam wrapped tube has the advantages of large specific surface area, and thus it has great potential to enhance the condensation heat transfer for marine shell and tube condensers, which have the requirements of "high compactness" and "high reliability" under sloshing conditions. In the present study, the effects of the metal foam pore density and the sloshing conditions on the condensation heat transfer on metal foam wrapped tubes were experimentally investigated. The pore density of metal foam covers the widely used structure ranging from 5 PPI to 40 PPI; the sloshing conditions include six-freedom motions of surging, swaying, heaving, rolling, pitching and yawing; the sloshing displacement ranges from 0 to 120 mm; the sloshing angle ranges from 0 to 12°; and the sloshing frequency ranges from 0 to 0.33 Hz. The experiment results show that the condensation heat transfer coefficients of metal foam wrapped tubes increase firstly and then decrease with the increase of PPI, and the 10 PPI metal foam wrapped tube shows the optimal condensation performance. The rolling motion has significant effect on the condensation heat transfer of metal foam wrapped tube, while the other five sloshing motions have negligible effect on the condensation heat transfer of metal foam wrapped tube. With the increase of rolling angle from 0 to 12°, the condensation heat transfer performance of 10 PPI and 20 PPI metal foam wrapped tube gradually increases and the increase rate of the condensation heat transfer coefficient is up to 12%; while the condensation heat transfer performance of metal foam wrapped tube with 5 PPI increases as the rolling angle is larger than 10°. With the increase of rolling frequency, the condensation heat transfer performance of metal foam wrapped tube decreases, and the decrease rate of the condensation heat transfer coefficient is up to 8%.
机译：金属泡沫包裹管具有大的表面积大的优点，因此它具有巨大的潜力，可以增强船用壳和管冷凝器的冷凝传热，这在晃动条件下具有“高紧凑性”和“高可靠性”的要求。在本研究中，实验研究了金属泡沫孔密度对金属泡沫包裹管上的冷凝传热对冷凝传热的影响。金属泡沫的孔密度覆盖广泛使用的结构，范围为5ppi至40 ppi;晃动条件包括六自由运动，摇曳，摇摆，悬重，滚动，俯仰和摇摆;晃动位移范围为0至120毫米;晃动角度范围为0至12°;并且晃动频率从0到0.33 Hz。实验结果表明，随后PPI的增加，金属泡沫包裹管的凝结传热系数增加，然后随着PPI的增加而降低，并且10 ppi金属泡沫包裹管显示出最佳的冷凝性能。轧制运动对金属泡沫包裹管的冷凝传热产生显着影响，而其他五个晃动运动对金属泡沫包裹管的冷凝传热产生可忽略不计的影响。随着0至12°的滚动角度的增加，10 ppi和20 ppi金属泡沫包裹管的冷凝传热性能逐渐增加，冷凝传热系数的增加速率高达12％;虽然金属泡沫包裹管的冷凝传热性能随5 ppi的增加随着滚动角度大于10°而增加。随着轧制频率的增加，金属泡沫包裹管的冷凝传热性能降低，冷凝传热系数的降低率高达8％。

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