Combined triangular curved vortex generator type circular tube fin heat exchanger

Abstract

The invention provides a combined triangular curved vortex generator type circular tube fin heat exchanger, which comprises circular tubes and fins, wherein the circular tubes are distributed along the flowing direction of gas; and the fins are sleeved on the circular tubes. The combined triangular curved vortex generator type circular tube fin heat exchanger is characterized in that: holes for sleeving the circular tubes are formed in the fins; an elliptical bump is punched in the front direction of each hole; a transverse elliptical pit is reserved at the back of each fin in the long shaft direction of the elliptical bump along main flowing direction; a pair of circular arc-shaped triangular curved vortex generators is punched on the rear part of each hole in the fin; a pair of circulararc-shaped small holes is reserved in the fin; and bottom edges and circular holes of the curved vortex generators connected with the fins are positioned on a concentric circle. The direction of a long shaft of the elliptical bump which is formed by punching on the fin and positioned at the front end of the circular tube is accordant with the flowing direction, so flow line property is better, the separation of fluids on the rear sides of the circular tubes is avoided, wake flow areas behind the circular tubes are reduced, the heat exchange performance of connecting surfaces between the fins and the wake flow areas is improved, and the flowing resistance loss of the wake flow areas is reduced.

Description

technical field [0001] The invention relates to the technical field of heat exchangers, in particular to a combined triangular curved surface vortex generator type round tube fin heat exchanger. Background technique [0002] Round tube fin heat exchangers are very versatile. With the continuous improvement of the production level of the national economy and the requirements of energy saving and emission reduction, it is very important to enhance the heat transfer of the round tube fin heat exchanger. Researchers are committed to enhancing the heat transfer capacity of the tube-fin heat exchanger while reducing the increase in resistance loss as much as possible, that is, reducing the operating cost of the tube-fin heat exchanger. Fins are usually installed on the outside of the tube to increase the heat transfer area and reduce thermal resistance, but the area of ​​the fins cannot be increased indefinitely due to the limitation of economy and fin efficiency. In order to fu...

AI Technical Summary

Problems solved by technology

However, the flow linearity of the fluid flowing through the circular tube is worse than that of the flat tube, and the resistance loss is large when the fluid flows near the stagnation point at the front end of the circular tube and the wake area of ​​the circular tube, and the heat transfer capacity of the fin surface The poorer area is the area in contact with the wake area of ​​the tube

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