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通过研究Ni-P化学镀层管不同微观结构对凝结传热的影响,表明用化学镀表面改性的镀管相对于普通的碳钢管,具有明显促进珠状凝结的效果,在凝结过程中表现为珠膜共存状态,可以获得较好的换热性能。同时镀层对换热性能的改善与镀层中纳米相的含量相关,随着纳米相含量的降低,镀层的表面能也随着降低,换热效率得到增强。增加镀层的非晶度可以获得更好的珠状凝结的效果。
By studying the microstructure of the Ni-P electroless plating tube on the condensation heat transfer, it shows that the electroless plating surface modification of the plating tube relative to the ordinary carbon steel tube has a significant effect of promoting the bead-shaped condensation in the condensation process showed Coexistence of bead film, you can get better heat transfer performance. At the same time, the improvement of the heat transfer performance of the coating is related to the content of the nanophase in the coating. With the decrease of the content of the nanophase, the surface energy of the coating decreases with the increase of the heat transfer efficiency. Increasing the degree of non-crystallinity of the coating results in better bead-like coagulation.