The high-frequency welded serrated finned tube is to open the steel strip before the high-frequency welding of the fins, and then use the skin effect of the high-frequency current to weld the serrated steel strip to the steel pipe at high temperature. The finned tubes produced by this process have high welding fastness and good heat exchange efficiency. In addition, after the fins are toothed, the turbulence effect is increased, the heat exchange efficiency is improved, and dust accumulation can be better prevented.

high-frequency welded serrated finned tube

High-frequency welded serrated finned tube

Serrated finned tubes are mainly used in the field of heat exchangers, and their advantages are: under the same heat transfer medium environment, open fins greatly increase the contact probability of high-temperature flue gas and fins compared with non-open fins, and correspondingly increase The heat transfer effect of the fins is improved, the average heat transfer coefficient is 5-13 percentage points higher, and because of the opening of the fins, the flow area of the flue gas and the effect of the wind tunnel are increased, and the pressure difference between the two sides of the fins is reduced, and the open fins The resistance of the tube is about 20% lower, which improves heat transfer efficiency and prevents dust accumulation.

serrated finned tube

Serrated finned tube

The serrated spiral finned tube is a new type of high-efficiency finned tube that is further improved on the basis of the original continuous spiral finned tube. Compared with the traditional continuous spiral finned tube, the serrated spiral finned tube has the advantages of easier manufacture, large total external area per unit tube length, good heat transfer performance, and less dust accumulation. It has been used in large-scale waste heat boilers and other It is used in the flue gas recovery device.

The serrated spiral finned tube

The serrated spiral finned tube

However, there are few basic studies on the enhanced heat transfer of serrated spiral finned tubes, which limits the application and optimization of this type of finned tube heat exchanger in practical engineering. In this paper, numerical simulation is used to study and analyze various structures and design schemes that affect its heat transfer characteristics, resistance characteristics and comprehensive characteristics.