On the effects of streamwise vortices on wall heat transfer
COMPACT HEAT EXCHANGERS FOR THE PROCESS INDUSTRIES
A general description of longitudinal vortices that may appear in a boundary layer is given. Gortelr vortices are then chosen as a prototype of longitudinal vortices and their hydrodynamics is briefly reviewed. The effects of Gortelr vortices on wall heat transfer, as seen in both experimental and numerical studies, are reviewed it is concluded that Gortelr vortices can effectively cause an overall heat-transfer enhancement only in the nonlinear regime. Experiments have shown a maximum heat-transfer intensification of up to 150% Over that of flat-plate, while numerical investigations predict enhancements as high as 300% to 400%. This enhancement is sensitive to the fluid Prandtl number.