H-shaped finned tube with radially-formed slits on surface

Abstract

The invention discloses an H-shaped finned tube with radially-formed slits on the surface. The H-shaped finned tube comprises a base tube and a plurality of fin sets which sleeve the two sides of theouter wall of the base tube correspondingly and are arranged in the axial direction of the base tube; each fin set is composed of two fins, the fins for each fin set are rectangular and are connectedwith the outer wall of the base tube in a symmetrical mode through side grooves of the fins arranged on the sides, next to the base tube, of the fins, the two fins for each fin set are located on thesame horizontal plane perpendicular to the axial direction of the base tube, a certain gap is formed between the two fins for each fin set, and the plurality of slits are formed in the surfaces of thefins; and the included angles between the slits and the incoming flow direction range from 40 degrees to 50 degrees, and the slits are symmetrically arranged on the two sides of the connecting linesbetween the center of the base tube and the four corners of the fins. According to the H-shaped finned tube, disturbance can be well carried out through the slits on the surfaces on the exterior fluidso as to damage the boundary layer to strengthen the heat transfer; then, the directions of the slits hardly affect the heat conduction inside the finned tube, and therefore, the fin efficiency cannot be reduced; and again, the directions of the slits and the flowing direction can reduce the flowing resistance which is increased due to the damage of the boundary layer as much as possible while the disturbance is formed and the damage boundary layer is damaged, moreover, the flowing friction area is reduced, and due to the two factors, the flowing resistance of the fined tube is integrally reduced.

Description

technical field [0001] The invention belongs to the technical field of heat exchangers for flue gas waste heat utilization, and is suitable for heat exchange equipment and heating equipment in industries such as energy, power, refrigeration, chemical industry, smelting, petroleum, etc., and specifically relates to an H-shaped fin with radial slits on the surface Tube. Background technique [0002] With the sustained and rapid development of my country's economy, the problem of energy supply shortage has become increasingly prominent, and energy conservation, emission reduction and consumption reduction have become the inevitable requirements of my country's economic and social development. As an important part of power, petroleum, chemical, refrigeration, metallurgy, and even aviation, rocket and other industrial processes, heat exchangers are of great significance for their safe and efficient operation. In various heat exchange equipment, increasing the heat exchange area ...

AI Technical Summary

Problems solved by technology

[0006] Traditional H-shaped fins have their inherent disadvantages. For example, the smooth surface of the fins does not form disturbances, which will cause the boundary layer to develop continuously with the flow, resulting in low heat transfer efficiency and deterioration of heat transfer.

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