Szukana fraza: [Abstract = "Five converging\-diverging or diverging\-converging geometrics, viz. variable cross\-section, parabolic, hyperbolic, hyperbolic cosine and cosine curve, are used as examples to illustrate the application of this method. Each example is concluded with a presentation of the formulae for the velocity flow on the outer surface of a thin porous layer. Upon introduction of hindrance factors, these formulae may be presented in the most general forms."]

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