Coefficient of surface friction with turbulent flow in boundary layer
Abstract
Taking a previously proposed approximation of the Thompson weighting function and an algebraic expression for a family of velocity profiles as a basis, a system of two equations is proposed that describe the friction law in implicit form as a dependence of the friction coefficient on the form factor H and the Reynolds number Re(theta), taking the thickness of momentum loss as the characteristic linear dimension. The graphic Thompson relaton is reconstructed by using these equations. To simplify calculations, an approximation of the solution of the equations is given that is valid over a wider range of form factors H and Reynolds numbers Re(theta) than the Ludwieg/Tillman relation.
 Publication:

USSR Rept Phys Math JPRS UPM
 Pub Date:
 July 1984
 Bibcode:
 1984RpPhM.......58K
 Keywords:

 Boundary Layers;
 Coefficient Of Friction;
 Friction Measurement;
 Turbulent Flow;
 Velocity Measurement;
 Approximation;
 Friction Factor;
 Kinetic Friction;
 Linear Equations;
 Reynolds Number;
 Fluid Mechanics and Heat Transfer