| 摘要: |
| 采用Ni-P-PTFE化学复合镀对管进行表面处理能有效减少污垢在换热表面上形成。然而，在实际应用上，复合镀层对管导热性能的影响是必须考虑的问题。实验利用热阻法对基Ni-P-PTFE复合镀层的导热系数进行测量，并利用Wilson plot方法处理数据最终得到Ni-P-PTFE复合镀层的导热系数。分析了镀层各组分镍(Ni)，聚四氟乙烯(PTFE)，碳(C)，磷(P)的质量分数对其导热性能的影响规律。结果表明，Ni-P-PTFE复合镀层的导热系数随PTFE和P的质量分数增大而降低，随C的质量分数增加而增大。当PTFE，C以及P的质量分数w(PTFE)=1.76%，w(C)=3.82%和w(P)=10.81%时，最大值为23.12 W/(m.K)。尽管复合镀层的导热系数不高，但由于其厚度很小，镀层产生的热阻仅为9.91×10-5~1.6×10-4 (m2.K)/W，所以复合镀层í?管仍保持很高的导热系数值314.88~357.55W/(m.K)。 |
| 关键词: 导热性能 热阻测量法 Ni-P-PTFE化学复合镀层 |
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| Investigation on Thermal Conductivity of Ni-P-PTFE Composite Coating on Copper Tubes |
| He Kailong,ChenYing,Zhong Tianming,Mo Songping |
| (Faculty of Material and Energy Guangdong University of Technology) |
| Abstract: |
| Copper tubes covered by Ni-P-PTFE composite coating can mitigate fouling adhesion on the heat exchange surface. However, the impact of composite coating on the thermal conduction of copper tubes should be considered. A thermal resistance method was utilized to measure the heat transfer coefficient of copper tubes with Ni-P-PTFE composite coatings. The thermal conductivities of these Ni-P-PTFE composite coatings were gained by means of Wilson plot in the end. The effects of Ni, PTFE, C and P contents were discussed on the thermal conductivity of Ni-P-PTFE composite coating. The results showed the thermal conductivity of these Ni-P-PTFE composite coatings were weakened by the increases of PTFE and P contents, but enhanced when the C content increased. It reached a peak value 23.12 W/(m.K) when w(PTFE)=1.76%, w(C)=3.82% and w(P)=10.81%, respectively. Although the thermal conductivities of the composite coatings were lower, their thermal resistances in the total heat transfer process were from 9.91×10-5 to 1.6×10-4(m2.K)/W due to their small thickness. Therefore, the tubes with Ni-P-PTFE composite coatings still kept high thermal conductivities 314.88~357.55W/(m.K). |
| Key words: thermal conductivity thermal resistance method Ni-P-PTFE composite coating |
