Evaluation of the turbulent kinetic dissipation rate in an agitated vessel
| Autor: | Darina Jasikova, Bohus Kysela, Jiri Konfrst, Radek Šulc, Zdenek Chara |
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| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Physics
business.industry Turbulence QC1-999 Baffle 02 engineering and technology Mechanics Dissipation Computational fluid dynamics 021001 nanoscience & nanotechnology Rushton turbine Physics::Fluid Dynamics Impeller 020401 chemical engineering Turbulence kinetic energy Statistical physics 0204 chemical engineering 0210 nano-technology business Reynolds-averaged Navier–Stokes equations |
| Zdroj: | EPJ Web of Conferences, Vol 143, p 02062 (2017) |
| Popis: | The design of agitated tanks depends on operating conditions and processes for that are used for. An important parameter for the scale-up modelling is the dissipation rate of the turbulent kinetic energy. The dissipation rate is commonly assumed to be a function of the impeller power input. But this approach gives no information about distribution of the dissipation rate inside the agitated volume. In this paper the distributions of the dissipation rate inside the agitated vessels are estimated by evaluations of the CFD (Computational Fluid Dynamics). The results obtained from RANS (Reynolds Averaged Navier-Stokes equations) k-e turbulent model and LES (Large Eddy Simulations) with Smagorinsky SGS (Sub Grid Scale) model are compared. The agitated vessels with standard geometry equipped with four baffles and stirred by either a standard Rushton turbine or a high shear impeller were investigated. The results are compared with mean dissipation rate estimated from the total impeller power input. |
| Databáze: | OpenAIRE |
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