Author(s)

E.G. Newman

Abstract

The dimensional analyses of an intense explosion, a turbulent jet and a laminar boundary layer are given as examples of the way the number of criteria of similarity can be reduced by decreasing the independent parameters or by increasing the basic units using plausible physical arguments. 1 Introduction Dimensional analysis is usually considered to be an essential tool for the experimenter in thermo-fluid dynamics. It provides the criteria of similarity for model experiments. It may also be important in theoretical computations which relate to affine geometries. The independent parameters which define the physical situation, when made non-dimensional, become the criteria of similarity and directly determine any non-dimensional dependent parameter. Thus in a simple fluid flow drag coefficient is a functi

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