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RESEARCH PAPERS

An Experimental and Numerical Study of Turbulent Swirling Pipe Flows

[+] Author and Article Information
R. R. Parchen, W. Steenbergen

Eindhoven University of Technology, Fluid Dynamics Laboratory, P.O. Box 513, NL 5600 MB, Eindhoven, The Netherlands

J. Fluids Eng 120(1), 54-61 (Mar 01, 1998) (8 pages) doi:10.1115/1.2819661 History: Received May 28, 1994; Revised November 03, 1997; Online December 04, 2007

Abstract

Both experimental and numerical studies have been performed aimed at the description of the decay of swirl in turbulent pipe flows. Emphasis is put on the effect of the initial velocity distribution on the rate of decay. The experiments show that, even far downstream of the swirl generator, the decay of the integral amount of angular momentum depends on the initial velocity distribution. This suggests that the description of the decay in terms of the widely suggested single exponential, function, is not sufficient. The calculations are based on (i) a standard k – ε model and (ii) models based on an algebraic transport model for the turbulent stresses. It appears that in a weakly swirling pipe flow, second-order models reduce to simple modifications of the standard k – ε model. While the standard k – ε model predicts a decay largely insensitive to the initial velocity distribution, the modified versions of the k – ε model, the ASM and the RSM, predict a strong sensitivity to the initial velocity distribution. Nevertheless, the standard k – ε model seems to predict the rate of decay of the swirl better than the second-order models. It is concluded that the corrections for the streamline curvature introduced by the second-order closures, largely overestimate the effect of rotation on the radial exchange of angular momentum.

Copyright © 1998 by The American Society of Mechanical Engineers
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