Reference : Surface aeration in baffled stirred tanks: hydrodynamics, mixing and mass transfer ch...
Scientific congresses and symposiums : Poster
Engineering, computing & technology : Chemical engineering
http://hdl.handle.net/2268/188194
Surface aeration in baffled stirred tanks: hydrodynamics, mixing and mass transfer characteristics
English
de Lamotte, Anne mailto [Université de Liège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques >]
Delafosse, Angélique mailto [Université de Liège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques >]
Calvo, Sébastien mailto [Université de Liège > Département de chimie appliquée > Génie chimique - Nanomatériaux et interfaces >]
Collignon, Marie-Laure mailto [Université de Liège > Département de chimie appliquée > Département de chimie appliquée >]
Toye, Dominique mailto [Université de Liège > Département de chimie appliquée > Génie de la réaction et des réacteurs chimiques >]
Sep-2015
Yes
No
International
10th European Congress of Chemical Engineering
from September 27th 2015 to October 1st 2015
Nice
France
[en] Stirred Tanks ; Hydrodynamics ; Mixing ; Mass Transfer ; PIV ; PLIF
[en] Biotechnological and chemical processes often need a supply of gas for acceptable product formation. In some applications - where either gas requirements/reactor volumes are relatively low, or bubbles are undesirable - aeration through the liquid free-surface is enough to meet the demand. In case of sparged stirred tanks, aeration through the liquid free-surface is a factor to be determined when scaling-up /down processes.
Gas-liquid transfer is strongly influenced by the hydrodynamic conditions. Two phenomena, occurring at different scales, can be coupled in order to explain mass transfer : (i) circulation (macroscale) and (ii) mixing/homogenization (microscale). Mixing/homogenization takes into consideration the small eddies
responsible for the rippled liquid free-surface and for the concentration gradients surrounding it. Circulation determines the fluid path across the reactor as well as its contribution of the surface aeration and leads to periodic and local deformation of the liquid free-surface. Circulation also accounts for the design of the reactor, where the scaling problems are focused.
The objective of this work is to develop an experimental approach able to fully (global and local quantities) characterize a chosen agitation configuration in terms of hydrodynamics, mixing and transfer, in order to assess the capability of computational methods to predict gas-liquid mass transfer due to aeration through the liquid free-surface.
Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
http://hdl.handle.net/2268/188194

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