The Convection Boundary layers Laminar versus turbulent flow Streamline Turbulent region Buffer laye LAminar 等 sublayer Lamina Turbulent Transition Characterization of laminarflow Low amount of mixing"of fluid within the boundary layer(smooth flow) Characterization of turbulentflow 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 EngineeringHeat Transfer Su Yongkang School of Mechanical Engineering # 13 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)