Experiments on swirling turbulent flows. I - Similarity in swirling flows

Yajnik, KS and Subbaiah, MV (1973) Experiments on swirling turbulent flows. I - Similarity in swirling flows. Journal of Fluid Mechanics, 60 (4). pp. 665-687.

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Abstract

The effects of swirl on internal turbulent flows are studied by conducting experiments on turbulent pipe flow with variable initial swirl. This first part of the study is primarily concerned with similarity laws. The mean velocity profiles, both away from and close to the wall, are found to admit similarity representations at sufficiently large Reynolds numbers, provided that flow reversal does not take place near the entrance. While the wall law is not sensibly dependent on swirl, the velocity defect law in its extended form is sensitive to swirl. Further, a logarithmic skin-friction law is obtained in which only the additive coefficient depends on swirl. This coefficient is found to vary linearly with the swirl angle in the range of the present experiments.

Item Type:	Journal Article
Uncontrolled Keywords:	Pipe flow;Swirling;Turbulent flow;Angular momentum;Axial flow;Flow velocity;Skin friction;Velocity distribution
Subjects:	AERONAUTICS > Aerodynamics
Division/Department:	Fluid Dynamics, Fluid Dynamics
Depositing User:	Ms. Alphones Mary
Date Deposited:	04 May 2006
Last Modified:	24 May 2010 09:39
URI:	http://nal-ir.nal.res.in/id/eprint/930

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