Estimation of turbulence dissipation rate by Large eddy PIV method in an agitated vessel

Estimation of turbulence dissipation rate by Large eddy PIV method in an agitated vessel

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The distribution of turbulent kinetic energy dissipation rate is important for design of mixing apparatuses in chemical industry.Generally used experimental methods of velocity measurements for measurement in complex geometries of an agitated vessel disallow measurement in resolution of Soundproofing Mat small scales close to turbulence dissipation ones.Therefore, Particle image velocity (PIV) measurement method improved by large eddy Ply approach was used.Large eddy PIV method is based on modeling of smallest eddies by a sub grid scale (SGS) model.This herman-oak-browband-work-bridle method is similar to numerical calculations using Large Eddy Simulation (LES) and the same SGS models are used.

In this work the basic Smagorinsky model was employed and compared with power law approximation.Time resolved PIV data were processed by Large Eddy PIV approach and the obtained results of turbulent kinetic dissipation rate were compared in selected points for several operating conditions (impeller speed, operating liquid viscosity).