The Convection Boundary Layers Laminar Versus Turbulent Flow Streamline UA =X,4 Turbulent region 三 Buffer layer Laminar sublayer Laminar Turbulent Transition Characterization of laminar flow Low amount ofmixing"of fluid within the boundary layer(smooth flow) Characterization of turbulent flow High amount of mixing of fluid within the boundary layer (irregular flow) High amount of mixing means increased surface friction as well as convection transfer rates (heat and mass) Heat Transfer Su Yongkang School of Mechanical Engineering# 15 Heat Transfer Su Yongkang School of Mechanical Engineering The Convection Boundary Layers Laminar Versus Turbulent Flow Characterization of laminar flow • Low amount of “mixing” of fluid within the boundary layer (smooth flow) Characterization of turbulent flow • High amount of mixing of fluid within the boundary layer (irregular flow) • High amount of mixing means increased surface friction as well as convection transfer rates (heat and mass)