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Observations and LDA measurements of confined turbulent vortex flow

Published online by Cambridge University Press:  19 April 2006

M. P. Escudier ,
J. Bornstein  and
N. Zehnder
M. P. Escudier
Affiliation:
Brown Boveri Research Centre, CH-5405 Baden-Dättwil, Switzerland
J. Bornstein
Affiliation:
Brown Boveri Research Centre, CH-5405 Baden-Dättwil, Switzerland
N. Zehnder
Affiliation:
Brown Boveri Research Centre, CH-5405 Baden-Dättwil, Switzerland
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Abstract

A series of LDA measurements and visual observations of confined turbulent vortex flow are described. The experiments were performed with water as the fluid medium in a vortex tube of length-to-diameter ratio L/D = 3.8 for a range of exit diameters De between De/D = 1 and 0.18. The experiments reveal a remarkable change in the vortex structure as De is reduced: from a thick core with an axial-velocity defect in the centre, and even reversed flow, to a thin annular jet-like core with a peak axial velocity more than an order of magnitude greater than the average value and again a central velocity deficit. The corresponding swirl profiles are not remarkable and are well-represented under all conditions by the solution of Burgers (1948), albeit with a velocity maximum which is strongly dependent upon De.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 98 , Issue 1 , 15 May 1980 , pp. 49 - 63
Copyright
© 1980 Cambridge University Press

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Footnotes

Laser-Doppler anemometer.

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