In this chapter, the authors apply their knowledge of boundary layers to discover a relationship between flow properties and the resultant wall shear stress which is at the root of frictional resistance. The discussion makes use of the conservation of mass and momentum principles. Conservation of momentum states that the rate of change of momentum in a control volume is equal to the sum of external forces acting on the control volume according to Newton's second law. The authors are interested in the force and shear stress acting parallel to the wall, i.e. in this case the x‐direction. The partial differential equation for the shear stress involves three unknown functions and their derivatives: exterior flow velocity, displacement thickness, and momentum thickness. Displacement and momentum thickness, in turn, depend on the boundary layer thickness, which is used as the upper limit for the defining integrals.
Wall Shear Stress in the Boundary Layer
Fundamentals of Ship Hydrodynamics ; 118-131
2019-05-06
14 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch