Abstract
This chapter discusses the nature of transition. The problem of the transition of the laminar type of flow into the turbulent type is rather an old one. Much better success is achieved by the assumption that small disturbances are superposed upon the basic laminar flow. These disturbances are composed of the harmonic oscillations that propagate in the direction of the basic flow. The mathematical formulation of this picture for the instability of laminar flows without compressibility is due to Lord Rayleigh. However, he neglected the influence of viscosity on the disturbances. By linear combination of the asymptotic integrals and by use of the boundary conditions, the neutral stability curve is obtained. For the flow along the flat plate, the amplification of the oscillations inside the neutral stability curve has been calculated. The method of computation of the neutral stability curve was based especially on heuristic arguments.
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