0
RESEARCH PAPERS

A Generic Centerline Velocity Decay Curve for Initially Turbulent Axisymmetric Jets

[+] Author and Article Information
George Papadopoulos, William M. Pitts

Building and Fire Research Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899

J. Fluids Eng 121(1), 80-85 (Mar 01, 1999) (6 pages) doi:10.1115/1.2822016 History: Received March 23, 1996; Revised November 25, 1998; Online December 04, 2007

Abstract

Recently the authors introduced a length scale which effectively collapsed the near field centerline development of velocity and mass fraction for variable density axisymmetric jets whose initial conditions correspond to those of fully developed turbulent pipe flow. The new length scale incorporated the initial mass, momentum, and turbulence intensity per unit area to capture the Reynolds number dependence of near field development for the velocity and scalar distributions observed in low Reynolds number turbulent jets. The presents paper extends the analysis for a constant density jet to the intermediate and self-similar far fields further downstream using a dynamic length scale based on the local centerline turbulence intensity. The normalized mean velocity distributions of an air jet collapse over the entire flow distance investigated velocity distributions of an air jet collapse over the entire flow distance investigated velocity distributions of an air jet collapse over the entire flow distance investigated when the axial distance is normalized by the proposed length scale, thus scaling the virtual origin shift and effectively incorporating the Reynolds number dependence.

Copyright © 1999 by The American Society of Mechanical Engineers
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Discussions

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In