Abstract
The present work is an experimental study of the evolutioncharacteristics of swirl in the flow in a pipe at a moderately highReynolds number and over a wide range of swirl numbers characterisingthe swirl strength. The measurements are done by 3D LDV in a speciallydesigned facility that works on the principle of refractive-indexmatching. Swirl with the well-defined distribution of a constant angularvelocity is introduced into the test section of this facility by a swirlgenerating device in which a tube bundle in the pipe rotates about thepipe axis. The measurements have been processed to yield themean-velocity vector and the Reynolds stress tensor in this flow. Ananalysis of the measured evolution characteristics brings out a dominanteffect of swirl with a solid body rotation as the annihilation ofReynolds shear streses.
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