Simple velocity profile approximations: u(0) = 0 no slip u(δ) = U matching with outer flow uy(δ)=0 Use velocity profile to get Cf() and and then integrate () momentum integral equation to get (Rex) = δ* δ/3 = 2δ/15 θ H= 5/2 δ*/θ= Approximate solution Turbulent Boundary-Layer Ret = 5×105 3×106 for a flat plate boundary layer Recrit 100,000
Simple velocity profile approximations: u(0) = 0 no slip u(δ) = U matching with outer flow uy(δ)=0 Use velocity profile to get Cf() and () and then integrate momentum integral equation to get (Rex) δ* = δ/3 θ = 2δ/15 H= δ*/θ= 5/2 Approximate solution Turbulent Boundary-Layer Ret = 5×105 3×106 for a flat plate boundary layer Recrit 100,000
Chapter_9-11262012.docx