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Title: Attenuation Effects Of Pipe Roughness On Swirl And The Implications For Flow Meter Installation
Author: R C Mottram And m S Rawat
Source: 1986 International Symposium on Fluid Flow Measurement
Year Published: 1986
Abstract: Experiments are described in which the decay of swirling flow induced by an offset bend combination was measured in both smooth and artificially roughened 80 mm bore pipes. Measurements were also made of the changes in the calibration of flowmeters placed downstream of the bend combination with varying settling lengths of both smooth and rough pipes. These flowmeters included square-edged orifice plates and a vortex meter with a rectangular section bluffbody. It was found that the pipe roughness had a very marked effect on the rate of swirl decay and the minimum settling length of straight pipe required for the orifices. It is suggested that the existing specifications found in flow measurement standards for minimum straight pipe lengths for installations of this kind should be reviewed to take into account pipe roughness effects.

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