NUMERICAL SIMULATION OF ENHANCED HEAT TRANSFER IN NEW TYPE OF BIRD BEAK VORTEX GENERATOR
Installing vortex generators on the fins can significantly improve the shell-side heat transfer efficiency of shell-and-tube heat exchangers,but the improvement of heat transfer capacity often leads to the increase of flow resistance.Therefore,most of the traditional vortex generators have the problem of low comprehensive efficiency with high heat transfer and high flow resistance.In this study,the bionic bird beak structure was introduced into the vortex generator,and the heat transfer capacity j,flow resistance f and comprehensive thermal performance CPEC were studied in the range of Re=6000-26800 by Fluent software.The results show that the bird-beak vortex generator is an efficient heat transfer element with high heat transfer and low flow resistance.When Re=13000,the CPEC is 62.35% higher than that of the traditional rectangular wing.In addition,its heat transfer capacity will increase first and then decrease with the increase of the angle of attack α,reaching the maximum at α=30°,which is 26.83% higher than that of the empty channel.Increasing the oblique cut angle β is an effective way to reduce the flow resistance.The flow resistance f of the structure with β=24° is 47.03% lower than that of the structure without cut angle.
numerical simulationheat transfer performancethermal conductivityeddy current generatorcomprehensive thermal performance
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