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Dissipation scale and control of fine-scale turbulence in a plane mixing layer

Published online by Cambridge University Press:  26 April 2006

Yitshak Zohar  and
Chih-Ming Ho
Yitshak Zohar
Affiliation:
1Department of Mechanical Engineering, The Hong Kong University of Science and Technology, Hong Kong
Chih-Ming Ho
Affiliation:
2Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA 90095, USA
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Abstract

The entrainment of fluids from two streams into the shear region of an incompressible mixing layer is dominated by the evolution of large coherent structures. However, fine-scale mixing of the entrained fluids mainly occurs at the interfaces of the small-scale turbulence. In this investigation, experiments were conducted to understand the properties of the small scales and to explore a method for controlling the population of the fine-scale turbulence. Furthermore, a dissipation scale, ζ, is found from the zerocrossing of the time derivative of the velocity fluctuations. This scale characterizes the most probable size of fine-scale turbulence, which produces most of the viscous dissipation.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 320 , 10 August 1996 , pp. 139 - 161
Copyright
© 1996 Cambridge University Press

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