Distribution of the turbulent kinetic dissipation rate in an agitated vessel

0466455 - ÚH 2017 RIV CZ eng A - Abstract
Kysela, Bohuš - Sulc, R. - Konfršt, Jiří - Chára, Zdeněk - Fořt, I. - Ditl, P.
Distribution of the turbulent kinetic dissipation rate in an agitated vessel.
CHISA 2016 : 22nd international congress of chemical and process engineering : Abstracts. Praha: Česká společnost chemického inženýrství, 2016.
[International Congress of Chemical and Process Engineering /22./. 27.08.2016-31.08.2016, Prague]
R&D Projects: GA ČR GA16-20175S
Institutional support: RVO:67985874
Keywords : agitated vessel * dissipation rate * kinetic energy
Subject RIV: BK - Fluid Dynamics

The design of the agitated tanks depends on the proposed operating conditions and processes
for that they are used for. Namely dissipation rate of the turbulent kinetic energy is important
parameter for the scale-up modelling. The dissipation rate is commonly determined as integral
value based on power input of the impeller, but without information about distribution inside
the agitated volume. The cumulative distributions of the dissipation rate within an agitated
vessel are estimated by evaluations of the CFD (Computational Fluid Dynamics) results,
where the data was obtained from RANS (Reynolds Averaged Navier-Stokes equations) and
LES (Large Eddy Simulations). The simulations were performed for an agitated vessel
equipped with four baffles and stirred by a standard Rushton turbine (tank diameter 0.3 m,
impeller diameter 0.1 m, off-bottom clearance half of tank diameter, impeller speed 200 rpm).
The values of the dissipation rate from the LES calculations were approximated by computing
the SGS (Sub Grid Scale) dissipation rate.
Permanent Link: http://hdl.handle.net/11104/0264741