Fin-and-oval tube heat exchanger

Abstract

The invention provides a fin-and-oval tube heat exchanger, and relates to the technical field of finned heat exchangers. The heat exchanger comprises oval tubes arranged along the gas flowing direction and fins sleeved on the oval tubes, wherein round holes for sleeving the oval tubes are formed on the fins; a flange boss is arranged on the edge of each round hole, and the height of the flange boss equals to the interval between fins; and a pair of rectangular winglet vortex generators which are symmetrically distributed above and under the central line of the round holes are stamped on the rear part of each round hole, and a pair of rectangular pores are reserved on the fin. After the rectangular vortex generators are stamped on the rear flange of the hole for sleeving the oval tube, airflow can generate a vertical vortex through the vortex generators, and causes second flow along a main flow, so that mutual mixing between cold fluid and hot fluid is accelerated. Meantime, the vortex generators change the flowing direction, and a fluid channel reaching the tail part of the oval tube is formed between the oval tube and the vortex generators, so that the return flow zone at the tail part of the oval tube is reduced, the heat exchange performance between the fins at the tail end of the oval tube and fluid is improved, and mechanical energy consumption in a tail flow zone is reduced.

Description

technical field [0001] The invention relates to the technical field of tube-fin heat exchangers, in particular to a circular tube-fin heat exchanger. Background technique [0002] The round tube fin heat exchanger has a wide range of uses, and strengthening the heat transfer performance of the round tube fin heat exchanger can effectively reduce energy consumption and reduce emissions. Installing fins on the tube fin side of the round tube fin heat exchanger to increase the heat transfer area and reduce the thermal resistance on the gas side is an effective measure to improve heat transfer. Due to economical and size constraints, the area of ​​the fins cannot be increased indefinitely. In order to further improve the heat transfer performance of the round tube fin heat exchanger, the fin surface is made into various structures. Such as corrugated fins, slotted fins, louver fins, etc. A more effective way is to punch a vortex generator on the surface of the fin. The existe...

AI Technical Summary

Problems solved by technology

The outstanding problem is that there is a region with poor heat transfer capacity on the fin surface of the round tube fin heat exchanger, that is, the area in contact with the wake region of the round tube, which is usually called the "heat transfer dead zone", and this Larger drag loss in the wake region

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