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Transition of turbulent pipe flow

Rao, Achanta Ramakrishna and Kumar, Bimlesh (2009) Transition of turbulent pipe flow. In: Journal of Hydraulic Research, 47 (4). pp. 529-533.

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Abstract

The velocity profile in turbulent pipe flow is usually divided into two regions, a wall or inner region and a core or outer region. For the inner region, the viscosity and wall shear stress are the important parameters governing the velocity distribution whereas for the outer region, the wall reduces the velocity below the maximum velocity independent of viscosity. In the present work, a velocity model is proposed for turbulent flow in the wall region of a pipe covering the entire transition from smooth to rough flows. Coupling this model for the wall region with the power law velocity model for the core region, an equation for the friction factor is obtained. The model constants are evaluated by using Nikuradse's experiments in the fully smooth and rough turbulent flows. The model shows good agreement with the friction factor and the velocity profiles obtained by Nikuradse for the transition region of turbulent flow.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to International Association of Hydraulic Engineering and Research.
Keywords: Friction factor;Nikuradse experiments;Pipe flow;Rough turbulent flows;Smooth turbulent flows;Transition;Velocity profile.
Department/Centre: Division of Mechanical Sciences > Civil Engineering
Date Deposited: 11 Jan 2010 06:16
Last Modified: 11 Jan 2010 06:16
URI: http://eprints.iisc.ernet.in/id/eprint/25271

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