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Production process of composite tube finned tube

The composite tube finned tube has the advantages of a composite tube and a finned tube, and is a novel high-efficiency heat transfer tube, which has been extensively studied worldwide. It has been reported that both inner and outer stainless steel composite radial finned tubes and inner and outer stainless steel composite axial finned tubes have been produced by rolling and welding. However, these products developed in Japan are both external and internal smooth finned composite pipes, which do not fully utilize the internal surface area of ​​the pipe and improve its heat transfer performance. Therefore, the production process of composite finned tubes has not been reported in detail.
The fin of the composite tube finned tube is a fin that uses two (or more) different treatment methods to enhance fin heat transfer. Its outstanding feature is that the advantages of different strengthening methods can be combined on the same fin for better overall performance. Some experts and scholars have noticed the advantages of composite fins and began to pay attention to their development, but the current research is still not much. Sanders (3) installed a delta wing as a longitudinal vortex generator on the slotted blinds and optimized its structure. The results show that the heat transfer performance of the fins is 39% higher than that of the conventional louver fins, and the resistance is 23%. Tian et al. The heat transfer of corrugated fins and corrugated fins of right-angled triangular fins was studied using a turbulent flow model. The results show that the longitudinal vortices generated by the triangular fins can significantly improve the heat transfer in the wake region. In the course and arrangement, the heat transfer increased by 13.1% and 7%, respectively, and the resistance increased by 15.4% and 10.5%, respectively.
The bimetallic rolled finned tube is composed of a base tube and an outer package fin. The base pipe is usually a carbon steel pipe, a stainless steel pipe or a copper pipe. The aluminum tube is placed outside, and then the aluminum tube is extruded into fins with a special rolling mill, and the base tube is tightly wrapped in a thin underlayer outside the base tube.