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Title: The Decay Of Swirling Gas Flow In Long Pipes
Author: Susan E. McMANUS,BLAINE R. Bateman, James A. Brennan, Isaura Vasquez PANTOJA,DOUGLAS Mann,
Source: American Gas Association 1985
Year Published: 1985
Abstract: A characterization of swirling flow of nitrogen gas at ambient temperature, pressure of 4 MPa (600 psi), and Reynolds numbers of 800,000 to 1,400,000 is presented. Possible flowmeter measurement errors in a pipe of circular crosssection are given. An instrumented test section containing a hoi wire anemometer and a directional pitot tube for the measurement of swirl angles and velocities are described. The decay of 60 degrees of swirl across a 100-mm (4-inch) smooth-walled pipe was measured at 0, 10, 33, and 70 nominal pipe diameters. Results suggest that large values of swirl are possible in gaseous flow, ihat the decay of the swirl is very slow at high Reynolds numbers, and that reliance on long lengths of pipe to reduce swirl to acceptable levels may not be a practical solution to eliminating potential flow measurement errors attributable to swirl.

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