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Requirements for the surface roughness of the heat exchange tubes

Mr. Laijing Bu January 17, 2026

 

I. Requirements for the Surface Roughness of Heat Exchange Tubes

The surface roughness of heat exchange tubes refers to the unevenness of the tube wall surface, usually expressed by the Ra value. The smaller the Ra value, the smoother the surface, and the better the convective heat transfer performance.

In actual production, the surface roughness requirements of heat exchange tubes are determined according to different processes and usage scenarios. Generally speaking, the Ra value is required to be less than or equal to 0.8 μm, or even smaller. In addition, the surface roughness of heat exchange tubes should also comply with relevant standards and specifications to ensure that the heat exchanger has stable heat transfer performance and service life.

II. The Impact of Heat Exchange Tube Surface Roughness on Heat Exchanger Performance

The surface roughness of heat exchange tubes has a significant impact on the heat transfer performance of the heat exchanger, which includes the following aspects:

1. The influence of surface roughness on frictional resistance

The smoother the tube wall surface, the smaller the frictional resistance of the flowing fluid, thus reducing the energy consumption of the heat exchanger. Moreover, the rough surface is also prone to generating turbulence, which is helpful for improving the heat transfer efficiency of the heat exchanger.

2. The influence of surface roughness on heat transfer coefficient

Under certain conditions, the surface roughness of the tube wall also has an impact on convective heat transfer coefficient. Generally, the smaller the surface roughness of the tube wall, the larger the convective heat transfer coefficient, and the better the heat transfer effect.

3. The influence of surface roughness on pipeline resistance

Under the same pipeline length and flow conditions, the rougher the inner wall of the pipeline, the greater the resistance. Therefore, while meeting the heat transfer requirements, it is necessary to minimize the roughness of the pipeline to reduce energy consumption and improve heat transfer efficiency.

In conclusion, the surface roughness of heat exchange tubes has a significant impact on the heat transfer performance of the heat exchanger. It is necessary to determine the surface roughness requirements according to process requirements and standard specifications to ensure that the heat exchanger has stable heat transfer performance and service life.


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