Abstract

As there are no published data verifying the theoretical Fanning friction factors for streamline flow of air at low absolute pressures, an investigation was made of the pressure drops in 6 to 18-in-diam pipe lines in which room-temperature air was flowing at absolute pressures varying from 50 microns Hg to 1 mm Hg. The large number of pressure-drop readings taken at various rates of flow permits developing friction-factor curves for this type of flow. These are presented in this paper.

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