February 1, 2006 What is the Hydrodynamic Boundary Layer? The hydrodynamic Boundary Layer on a flat plate is a thin region adjacent to the surface (boundary) within which viscous effects are confined. How is the thickness of the Hydrodynamic Boundary Layer defined? The thickness of the hydrodynamic boundary layer is the distance from the wall where the velocity becomes 99% of U∞, where U∞is free-stream velocity. u(y)hydrodynamic0.99Uy∞=δ=What is the Thermal Boundary Layer? The thermal Boundary Layer on a flat plate is a thin region adjacent to the surface
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