Hostname: page-component-cd9895bd7-jn8rn Total loading time: 0 Render date: 2024-12-21T05:19:21.060Z Has data issue: false hasContentIssue false
  • English
  • Français

Flow structure of the free round turbulent jet in the initial region

Published online by Cambridge University Press:  19 April 2006

L. Bogusławski  and
Cz. O. Popiel
L. Bogusławski
Affiliation:
Heat and Mass Transfer Laboratory, Technical University of Poznań, Poland
Cz. O. Popiel
Affiliation:
Heat and Mass Transfer Laboratory, Technical University of Poznań, Poland
Get access Rights & Permissions [Opens in a new window]

Abstract

This note presents measurements of radial and axial distributions of mean velocity, turbulent intensities and kinetic energy as well as radial distributions of the turbulent shear stress in the initial region of a turbulent air jet issuing from a long round pipe into still air. The pipe flow is transformed relatively smoothly into a jet flow. In the core subregion the mean centre-line velocity decreases slightly. The highest turbulence occurs at an axial distance of about 6d and radius of (0·7 to 0·8)d. On the axis the highest turbulent kinetic energy appears at a distance of (7·5 to 8·5)d. Normalized distributions of the turbulent quantities are in good agreement with known data on the developed region of jets issuing from short nozzles.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 90 , Issue 3 , 13 February 1979 , pp. 531 - 539
Copyright
© 1979 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Abramovich, G. N. 1963 The Theory of Turbulent Jets. M.I.T. Press.
Abramovich, G. N., Krasheninnikov, S. J., Sekundov, A. N. & Smirnova, I. P. 1974 Turbulent Mixing of the Gas Jets (in Russian). Moscow: Nauka.
Bradbury, L. J. S. 1965 The structure of a self-preserving turbulent plane jet. J. Fluid Mech. 23, 31.Google Scholar
Crow, S. C. & Champagne, F. H. 1971 Orderly structure in jet turbulence. J. Fluid Mech. 48, 547–591.Google Scholar
Donaldson, C. DuP., Snedeker, R. S. & Margolis, D. P. 1971 A study of free jet impingement. Part 2. Free jet turbulent structure and impingement heat transfer. J. Fluid Mech. 45, 477–512.Google Scholar
Ginievski, A. S. 1969 Theory of Turbulent Jets and Wakes (in Russian). Moscow: Mashino-stroieniye.
Hill, B. J. 1972 Measurement of local entrainment rate in the initial region of axisymmetric turbulent air jets. J. Fluid Mech. 51, 773–779.Google Scholar
Hinze, J. O. 1975 Turbulence. McGraw-Hill.
Hinze, J. O. & Van der Hegge Zijnen, B. G. 1949 Transfer of heat and matter in the turbulent mixing zone of an axially symmetrical jet. Appl. Sci. Res. A 1, 435–461.Google Scholar
Lau, C. J. & Fisher, M. J. 1975 The vortex-street structure of ‘turbulent’ jets. Part 1. J. Fluid Mech. 67, 299–337.Google Scholar
Popiel, C. Z. O., Kamasa, A. & Boguslawski, L. 1976 Traversing mechanism. Heat Transfer Section Ann. Rep., Tech. Univ. Poznań.Google Scholar
Rajaratnam, N. 1976 Turbulent Jets. Elsevier.
Rodi, W. 1975 A new method of analysing hot-wire signals in highly turbulent flow, and its evaluation in a round jet. DISA Inf. 17, 9–18.Google Scholar
Rodi, W. & Spalding, D. B. 1970 A two-parameter model of turbulence and its application to free jets. Wärme Stoffübertragung 3, 85–95.Google Scholar
Sami, S., Carmody, Th. & Rouse, H. 1967 Jet diffusion in the region of flow establishment. J. Fluid Mech. 27, 231–252.Google Scholar
Wygnanski, I. & Fiedler, M. 1969 Some measurements in the self-preserving jet. J. Fluid Mech. 38, 577–612.Google Scholar