Comparisons of a Networks-of-Zones Fluid Mixing Model for a Baffled Stirred Vessel with Three-Dimensional Electrical Resistance Tomography

T. L. Rodgers1, F. R. Siperstein1, R. Mann1,* T. A. York2, A. Kowalski3

1School of Chemical Engineering and Analytical Science, University of Manchester, M60 1QD, UK

T.Rodgers@postgrad.manchester.ac.uk

2School of Electronic and Electrical Engineering, University of Manchester, M60 1QD, UK

3Unilever R & D Port Sunlight, Quarry Road East, Wirral, CH63 3JW, UK

ABSTRACT

Reliable models for the simulation of mixing vessels are important for the understanding of real life mixing problems. To achieve these models information about the mixing in the system must be measured to compare with the predicted values. Electrical resistance tomography has the capability to measure spatial and temporal changes within a vessel in three-dimensions even in optically inaccessible environments.

This paper discusses the creation of a network-of-zones model for the prediction of mixing within a vessel with a Cowles disk type agitator. Solving of the transport equations for the vessel predicts the concentration distribution of an inert tracer added to the vessel. The change in this distribution with time is calculated and compared with visual inspection of the vessel. The concentration distribution inside the vessel is also measured using electrical resistance tomography and shows good agreement with the predicted values.

Keywords Network-of-Zones, Electrical Resistance Tomography, Cowles Disk, Concentration Profile