Original title: Evaluation of the turbulent kinetic dissipation rate in an agitated vessel
Authors: Kysela, Bohuš ; Konfršt, Jiří ; Chára, Zdeněk ; Sulc, R. ; Jašíková, D.
Document type: Papers
Conference/Event: Experimental Fluid Mechanics 2016, Mariánské Lázně (CZ), 20161115
Year: 2017
Language: eng
Abstract: 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-epsilon 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.
Keywords: flow; large-eddy simulation
Project no.: GA16-20175S (CEP)
Funding provider: GA ČR
Host item entry: EPJ Web of Conferences

Institution: Institute of Hydrodynamics AS ČR (web)
Document availability information: Fulltext is available at external website.
External URL: https://www.epj-conferences.org/articles/epjconf/pdf/2017/12/epjconf_efm2017_02062.pdf
Original record: http://hdl.handle.net/11104/0276212

Permalink: http://www.nusl.cz/ntk/nusl-367312


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Research > Institutes ASCR > Institute of Hydrodynamics
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