Simulations on Heat Transfer Enhancement by Longitudinal Vortex Generators: StateoftheArt and Case Study

Numerical investigations on heat transfer enhancement and flow resistance in the airside of heat exchangers with longitudinal vortex generators(LVGs)have been reviewed.The following aspects were discussed:type and layout of LVGs;heat transfer enhancement and flow resistance performance of LVGs;mechanism of heat transfer enhancement of the longitudinal vortices.The laminar flow and heat transfer in rectangular channels with obliquecut semielliptic cylinder shell and obliquecut semielliptic cylinder were numerically simulated respectively.The results show heat transfer enhancements of these two types of vortex generators are almost identical and 72.7%～133.1% higher than smooth channel.Pressure losses increase about 100.4%～168.3% and 108.1%～183.5% higher than smooth channel respectively.The comprehensive performance of heat transfer enhancement and flow resistance of obliquecut semielliptic cylinder shell is superior to that of obliquecut semielliptic cylinder.