A laminar boundary layer is observed to grow on a flat plate such that the pressure is constant everywhere. If the boundary layer velocity profile is given by: where u is the velocity at a distance y from the surface, δ is the boundary layer thickness and Ue is the freestream velocity. (a) Show that θ/δ = 0.139, where θ is the momentum thickness. (b) Find the viscous stress on the plate in terms of the viscosity, the boundary layer thickness, and the freestream velocity.

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Properties of Fluids

The term fluid represents a type of substance that can easily change its shape under any external pressure/force and can flow. Fluids can acquire any shape in which it is stored and can resist normal stresses but cannot resist shear stress in rest condition. Whenever external shear stress is applied to fluids, it starts to flow. The fluids may be liquid or gas. Example- water, air, etc.