Hostname: page-component-78c5997874-lj6df Total loading time: 0 Render date: 2024-11-07T05:20:58.433Z Has data issue: false hasContentIssue false
  • English
  • Français

Measurements of entrainment by axisymmetrical turbulent jets

Published online by Cambridge University Press:  28 March 2006

F. P. Ricou  and
D. B. Spalding
F. P. Ricou
Affiliation:
Mechanical Engineering Department, Imperial College of Science and Technology, London, S.W. 7
D. B. Spalding
Affiliation:
Mechanical Engineering Department, Imperial College of Science and Technology, London, S.W. 7
Get access Rights & Permissions [Opens in a new window]

Abstract

A new technique is described for measuring the axial mass flow rate in the turbulent jet formed when a gas in injected into a reservoir of stagnant air at uniform pressure. The jet is surrounded by a porous-walled cylindrical chamber, and air is injected through the wall until the pressure in the chamber is uniform and atmospheric, a condition which is taken to signify that the ‘entrainment appetite’ of the jet is satisfied.

Measurements made with the apparatus have allowed the deduction of an entrainment law relating mass flow rate, jet momentum, axial distance and air density, regardless of the injected gas, and including the effects of buoyancy. When the injected gas burns in the jet the entrainment rate is up to 30% lower than when it does not.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 11 , Issue 1 , August 1961 , pp. 21 - 32
Copyright
© 1961 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

Batchelor, G. K. 1954 Quart. J. Roy. Met. Soc. 80, 339.
Cleeves, V. & Boelter, L. M. K. 1947 Chem. Engng Progr. 43, 123.
Grimmett, H. L. 1948 M. S. Thesis, University of Illinois.
Krzywoblocki, M. Z. 1956 Jet Prop. 26, 760.
Morton, B. R., Taylor, G. I. & Turner, J. S. 1950 Proc. Roy. Soc. A, 234, 1.
Pai, S. I. 1954 Fluid Dynamics of Jets. New York: Van Nostrand.
Polomik, E. E. 1948 M. S. Thesis, University of Illinois.
Reichardt, H. 1942 V. D. I.-Forschungsheft. p. 414. (2nd ed. 1951).
Schlichting, H. 1955 Boundary Layer Theory. London: Pergamon Press.
Spalding, D. B. 1950 J. Sci. Instrum. 27, 310.
Squire, H. B. & Trouncer, J. 1944 Round jets in a general stream. Aero. Res. Counc. Tech. Rep. R. & M. no. 1974.
Thring, M. W. & Newby, M. P. 1953 Fourth Symposium on Combustion, p. 789. Baltimore: Williams and Wilkins.
Voorheis, T. S. & Howe, E. D. 1939 Proc. Pac. Coast Gas Ass. 30, 198.
Yih, C. S. 1951 Proc. First U. S. Nat. Congr. Appl. Mech. p. 941.