An experimental study of impulsively started turbulent axisymmetric jets

S. Bajpai and M. S. Tirumkudulu ()

The European Physical Journal B: Condensed Matter and Complex Systems, 2008, vol. 61, issue 3, 293-297

Abstract: An impulsively started turbulent jet injected into quiescent surroundings with a constant inlet velocity has been studied experimentally. Results show that the jet length increases linearly with the square-root of time, over a wide range of Reynolds number calculated with respect to the jet diameter. The celerity factor, x f /t U, has been found to be nearly constant at 2.47 throughout with a 5% variance. Here, x f is the jet length, t is the time and U is the jet exit velocity. These results compare favourably with earlier results reported at lower Reynolds numbers. Finally, we present a simple model based on the integral energy balance of the turbulent boundary layer equation for an impulsively started turbulent axisymmetric jet. The model predicts a jet length that scales as, $(x_f/d)=\sqrt{(9B/10) (t U /d) }$ where d is the nozzle diameter and B(≈6.0) is the velocity-decay constant. This gives a celerity factor, $\alpha\equiv \sqrt{9B/10}=2.32$ in close agreement with the experiments. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2008

Keywords: 47.27.wg Turbulent jets; 47.27.nb Boundary layer turbulence (search for similar items in EconPapers)
Date: 2008
References: View complete reference list from CitEc
Citations:

Downloads: (external link)
http://hdl.handle.net/10.1140/epjb/e2008-00068-2 (text/html)
Access to full text is restricted to subscribers.

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:spr:eurphb:v:61:y:2008:i:3:p:293-297

Ordering information: This journal article can be ordered from
http://www.springer.com/economics/journal/10051

DOI: 10.1140/epjb/e2008-00068-2

Access Statistics for this article

The European Physical Journal B: Condensed Matter and Complex Systems is currently edited by P. Hänggi and Angel Rubio

More articles in The European Physical Journal B: Condensed Matter and Complex Systems from Springer, EDP Sciences
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().