Friction coefficients in the inlet length of smooth round tubes

Ascher H. Shapiro, R. Douglas Smith
Nov 1948

An experimental study was made of friction coefficients near the inlet of smooth, round tubes with bellmouth entrances. The range of Reynolds number, based on tube diameter, was from 39,000 to 590,000; these values corresponded to turbulent flow in the region of a fully developed velocity profile.

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