Predictions of the Laminarization Phenomena in an Axially Rotating Pipe Flow

[+] Author and Article Information
Shuichiro Hirai, Toshimi Takagi

Department of Mechanical Engineering, Osaka Univ., Suita, Osaka, 565, Japan

Masaharu Matsumoto

Sanyo Electric Company, Tottori, 680, Japan

J. Fluids Eng 110(4), 424-430 (Dec 01, 1988) (7 pages) doi:10.1115/1.3243573 History: Received November 21, 1986; Online October 26, 2009


Numerical predictions are compared with the experiments of swirling turbulent flows in a pipe where the swirl is driven by the pipe wall rotating around the pipe axis. The laminarization phenomena, that is, the deformation of the axial velocity profile into a shape similar to the laminar one and the decrease of the friction factor, caused by the pipe rotation can be predicted by the calculations applying the stress equation turbulence model. However, calculations applying two types of the k-ε two-equation models with and without the modification by the Richardson number, cannot predict the laminarization phenomena and the characteristic behaviors due to the swirl. The interpretations of the laminarization phenomena and the applicability of the turbulence models are presented.

Copyright © 1988 by ASME
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