Abstract
Particle Image Velocimetry (P.I.V.) technique is used in mechanically agitated tank equipped with a Rushton turbine. This chapter focuses on the analysis of the flow field in terms of mean flow and fluctuating motion. The fluctuations are expressed in terms of turbulence (random fluctuation) and pseudoturbulence (fluctuation induced by the periodic motion of the blades). From instantaneous velocity field taken in a plane with at given angles relative to the position of the blade, it is possible to derive spatial two-point velocity correlation functions in order to deduce integral length scales of turbulence and local dissipation rate of turbulent kinetic energy. P.I.V. technique is based on the following steps—seeding the fluid flow volume under investigation, illuminating a slide of the flow field with a pulsing light sheet, recording two images of the fluid flow with a short time interval between them, using a numerical CCD camera, and finally, processing these images by dividing the whole images into interrogation areas and using inter correlation techniques to get the instantaneous velocity field. The kinetic energy of each component of these fluctuations is determined. P.I.V. is used to estimate integral length scale of turbulence and local dissipation rate of turbulent kinetic energy. The state of the turbulence is also analyzed to estimate the influence of the blade motion in terms of anisotropy.
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