Optical Methods and Unconventional Experimental Setups in Turbulence Research

Authored by: Roi Gurka , Eliezer Kit

Handbook of Environmental Fluid Dynamics

Print publication date:  December  2012
Online publication date:  December  2012

Print ISBN: 9781466556010
eBook ISBN: 9781466556041
Adobe ISBN:

10.1201/b13691-39

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Abstract

Particle image velocimetry (PIV) and other optical methods have been rapidly developed and advanced during the last two decades (1990s and 2000s), which have provided other means of access to the fundamental properties of turbulence that include assessment of the velocity gradient tensor (full or some components) and determination of the vorticity field (full vector or some of the components). This chapter briefly describes and highlights these remarkable developments and points out some of the most important things about the emerging methodology of turbulence measurements and the discovery of important features of coherent structures that develop in anisotropic turbulence due to shear, stratification, rotation, or electromotive forces. The essence of this methodology may be best expressed by the following citation:

And this experiment you will make with a square glass vessel, keeping your eye at about the center of one of these walls; and in the boiling water with small movement you may drop a few grains of panic-grass because by means of the movement of these grains you can quickly know the movement of the water that carries them with it. And from this experiment you will be able to proceed to investigate many beautiful movements which result from one element penetrating into another (i.e., ‘air’ into water). (Leonardo Da Vinci)

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