Abstract

In the present paper the author endeavors to present in a simple manner the various laws of similarity and to indicate the ways in which they may be applied to model-testing practice. After explaining the principles of mechanical similarity, he describes different methods of deriving its laws, following which he discusses the functions of Reynolds’, Froude’s, and Mach’s numbers. The closing section of the paper deals with special applications of the laws set forth to fluid resistance, propellers and fans, cavitation in ship propellers, hydraulic turbines and pumps, flow through pipes and channels, and to fluid problems related to acoustic velocity.

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