Study On The Turbulent Flow And Heat Transfer Enhancement Of Tube Bank Fin Heat Exchanger With Interrupted Annular Groove Fin

With the progress of science and technology and the accumulation of human wealth,a large amount of primary energy is consumed,underutilized,exhaust residue on the environment has produced destructive pollution.At present,the main factor of bad pollution in our country is the single variety of energy and the low degree of effective utilization.In order to protect the environment and save energy,our country must improve the effective utilization rate of energy.Heat exchanger in the transformation of energy has a pivotal position,therefore,based on the heat exchange mechanism,scientific analysis of the factors affecting heat exchanger heat exchanger,academic research and production and processing have helped,interrupted annular groove fin belong to a grooved fin,fin surface heat exchange coefficient is relatively large,while the flow resistance is relatively small,the overall heat exchange performance can basically meet the engineering needs,is a relatively wide range of applications of the groove fin.In this paper,the flow and heat exchange characteristics of the cross-section allotation diameter,arc length and fin spacing to the fin tube channel of the i interrupted annular groove fin are studied,and the following conclusions are obtained:(1)interrupted annular groove has the role of conduction on the fins,induces the fluid to flow to the tube fin-type heat exchanger flat-straight fin-piece tail vortex area,which can reduce the size of the tail vortex area of the round tube,and effectively improve the heat exchange of the tail vortex area after the tube.Moreover,due to the existence of the interrupted annular groove,the boundary layer of the fin surface is damaged and cannot be continuously developed,and the heat exchange performance of the fins is enhanced.With the increase of the diameter of the interrupted annular groove,the tail vortex area of the round tube is gradually reduced.(2)The flow and heat transfer characteristics within the wing channel of the interrupted annular groove fin are more obviously affected by the cross-section diameter of the interrupted annular groove,and with the increase of the diameter of the ring surface groove,the enhanced heat transfer effect in the tube beam channel increases and decreases first,and the cross-section al-section diameter Dg in the ring groove is increased.The enhanced heat transfer effect is best at 2.8,and with the increase of Re,the enhanced heat transfer factor of the ring-side groove fins of the cross-section al-section diameter of different ring surface grooves increases first and decreases first,and the strengthening heat transfer factor JF is maximized at Re.10000.(3)The flow and strengthening heat transfer characteristics within the wing channel of the interrupted annular groove fin are less affected by the long angle of the ring surface groove arc,and with the increase of Re,the reinforced heat transfer factor of the ring groove fin at the long angle of the arc of the different ring surface groove sits first and then decreases,and the maximum value is obtained by the strengthening heat transfer factor JF at Re 10000.At Re smaller,the long angle of the ring surface groove has less influence on the reinforced heat transfer factor JF,and the difference between the reinforced heat transfer factor JF at the long angle of the ring-surface groove is small.(4)The flow and heat transfer characteristics in the fin tube channel of the interrupted annular groove fin are greatly affected by the space spacing of the fins,and within the working conditions studied in this paper,the enhanced heat transfer characteristics decrease with the increase of fin spacing.