Evaluation of the turbulent kinetic dissipation rate in an agitated vessel
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Date
2017
Journal Title
Journal ISSN
Volume Title
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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-ε 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.
Description
Subject(s)
agitated vessel, mixing process, industrial optimization
Citation
ISSN
2100-014X