Estimation of turbulence dissipation rate by Large eddy PIV method in an agitated vessel
1 Institute of Hydrodynamics, AS CR, v.v.i. Pod Patankou 30/5, 166 12 Prague 6, Czech Republic
2 Institute for Nanomaterials, Advanced Technology and Innovation, Technical University of Liberec, Studentska 1402/2, 461 17 Liberec, Czech Republic
3 Department of Process Engineering, Faculty of Mechanical Enginnering, Czech Technical University in Prague, Technicka 4, 166 07 Prague 6, Czech Republic.
a e-mail: email@example.com
Published online: 6 May 2015
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 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 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).
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