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首页> 外文期刊>International Journal of Heat and Mass Transfer >Condensation mode transition and condensation heat transfer performance variations of nitrogen ion-implanted aluminum surfaces
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Condensation mode transition and condensation heat transfer performance variations of nitrogen ion-implanted aluminum surfaces

机译：氮离子注入铝表面的冷凝模式转变和冷凝传热性能变化

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摘要

Aluminum substrate specimens are irradiated with nitrogen ions at various ion dose and ion energy levels in order to realize dropwise condensation on the specimen surfaces. Dropwise steam condensation initially occurs on these specimens, but the condensation mode changes into filmwise condensation. When the condensation mode changes to filmwise condensation, the heat transfer coefficient is measured to be approximately 40% lower than that predicted using the Nusselt theory; in addition, the color of the surface changes from yellow-brown to silver-white. This surface color change is the result of the hydrolysis reaction between the condensate and the nitrogen ion-implanted aluminum surface. Non-condensable gas is generated by the hydrolysis reaction, and this non-condensable gas diminishes the heat transfer coefficient. In addition, the material composition of the specimen’s surface changes and causes the transition of the condensation mode.
机译：铝基板样品以各种离子剂量和离子能级照射氮离子，以便在样品表面上逐滴凝结。这些样品最初会发生逐滴蒸汽凝结，但凝结模式会变为薄膜凝结。当冷凝模式变为薄膜冷凝时，传热系数被测得比使用Nusselt理论预测的传热系数低约40％。另外，表面的颜色从黄棕色变为银白色。这种表面颜色变化是冷凝液和注入氮离子的铝表面之间发生水解反应的结果。水解反应产生不凝性气体，该不凝性气体降低了传热系数。此外，试样表面的材料成分也会发生变化，并导致凝结模式的转变。

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