Abstract
This chapter presents an introduction to the theory of plane, steady jet flows. In jet theory, the flows considered are bounded partly by solid walls and partly by free surfaces on which the pressure is constant. The substitution of an ideal fluid for a fluid that possesses only a low viscosity is quite common. The boundary layer is laminar or turbulent depending on the Reynolds number, and the point of boundary layer separation from the body will vary accordingly. The picture of the flow around a body depends on many factors, such as the shape of the body and the Reynolds number of the flow. It is also possible to have flows in which not only the boundary layer but also the whole flow separates from the body. The points of flow separation in the jet flow about a body or a flow from a vessel may not depend on the characteristics of the boundary layer. The assumption of the absence of vorticity is closely related to the assumption of an ideal fluid. The absence of vorticity simplifies considerably the mathematical solution of the problem.
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