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Turbulent convective velocities (broadband and wavenumber dependent) in a plane jet

Published online by Cambridge University Press:  20 April 2006

V. W. Goldschmidt ,
M. F. Young  and
E. S. Ott
V. W. Goldschmidt
Affiliation:
Ray W. Herrick Laboratories, Purdue University School of Mechanical Engineering, West Lafayette, Indiana 47907, USA
M. F. Young
Affiliation:
Ray W. Herrick Laboratories, Purdue University School of Mechanical Engineering, West Lafayette, Indiana 47907, USA
E. S. Ott
Affiliation:
Ray W. Herrick Laboratories, Purdue University School of Mechanical Engineering, West Lafayette, Indiana 47907, USA
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Abstract

An investigation into the magnitude and direction of the convective velocity in a plane air jet was performed. Convective velocities were obtained from cross-correlation measurements. They are defined as the ratio of the spacing between two hot-wire probes and the time delay between their signals to reach maximum correlation. These velocities were larger in magnitude than the local mean velocities for lateral distances greater than the half-width of the jet. Frequency analysis of the convective velocity indicates that the large-scale eddies move slower than the mean flow while the small scales move faster. Based on the convective velocity vector, broadband ‘convection lines’ were defined and found to point outward with respect to the streamlines for all values of y/b [Gt ] 0·5. Likewise, frequency investigation indicates that ‘convection lines’ point outward for all y/b [Lt ] 1·3 and then inward for larger values of y/b.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 105 , April 1981 , pp. 327 - 345
Copyright
© 1981 Cambridge University Press

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