Numerical investigation of heat transfer enhancement in heat exchangers by changing the angle of attack in vortex generators

Farshid Marzban¹ Mehrzad Ahmadi² Seyed Ali Agha Mirjalili³

1) master of mechanical engineering ,Azad university of Yazd
2) master of mechanical engineering ,Azad university of Yazd

IOI Code : XYFE-BBEBB
Publication : 5th International Conference on Research in Science & Technology(5rstconf.com)
Abstract :
    Nowdays, The air-cooled heat exchangers are important part of in heat transfer industrial technology. Compact heat exchangers are the most common of this type that use In many industrial and engineering sectors such as automotive, refrigeration, air conditioning, power plants, etc. One of the most important feature of compact heat exchanger is the size of its, and to reduce its volume due to the same heat capacity, can be used vortex generators. Position of vortex generator in the side of air flow cause spinning flow, Production vortex in the vicinity of the surface, Reducing the thickness of the boundary layer, Increase mixing flow in upstream and downstream of vortex generator, improve the flow impact with vicinity surfaces, Thereby heat transfer increases. Increasing pressure drop is achieved by increasing heat transfer. In this research we intend to investigate flow field and temperature field changes and their impact on the heat transfer enhancement use the vortex generator to alter air flow regime through the channel. In this research, the range of angle of attack of the vortex generator, is 30, 45, 60 degrees in both directions, Clockwise and Counterclockwise, and installed behind pipes. The results show that the range of input air velocity in the channel From 400 to 1600 in Reynolds Number heat transfer enhancement of 16.3 to 27% in the linear arrangement of 7.78 to 23.18 percent in the arrangement will be staggering.

Keywords : heat exchangers heat transfer enhancement vortex generators